diff --git a/semantic_conventions/http-common.yaml b/semantic_conventions/http-common.yaml
index 3295762007..4e51e8765d 100644
--- a/semantic_conventions/http-common.yaml
+++ b/semantic_conventions/http-common.yaml
@@ -5,10 +5,57 @@ groups:
     prefix: http
     attributes:
       - id: request.method
-        type: string
+        type:
+          allow_custom_values: true
+          members:
+            - id: connect
+              value: "CONNECT"
+              brief: 'CONNECT method.'
+            - id: delete
+              value: "DELETE"
+              brief: 'DELETE method.'
+            - id: get
+              value: "GET"
+              brief: 'GET method.'
+            - id: head
+              value: "HEAD"
+              brief: 'HEAD method.'
+            - id: options
+              value: "OPTIONS"
+              brief: 'OPTIONS method.'
+            - id: patch
+              value: "PATCH"
+              brief: 'PATCH method.'
+            - id: post
+              value: "POST"
+              brief: 'POST method.'
+            - id: put
+              value: "PUT"
+              brief: 'PUT method.'
+            - id: trace
+              value: "TRACE"
+              brief: 'TRACE method.'
+            - id: other
+              value: "other"
+              brief: 'Any custom HTTP method that the instrumentation has no prior knowledge of.'
         requirement_level: required
         brief: 'HTTP request method.'
         examples: ["GET", "POST", "HEAD"]
+        note: |
+          HTTP request method SHOULD be one of the methods defined in [RFC9110](https://www.rfc-editor.org/rfc/rfc9110.html#name-methods)
+          or the PATCH method defined in [RFC5789](https://www.rfc-editor.org/rfc/rfc5789.html).
+          Instrumentation MAY additionally support the closed set of custom HTTP methods defined in
+          [HTTP method registry](https://www.iana.org/assignments/http-methods/http-methods.xhtml) or a private registry.
+          If the HTTP request method is not known to the instrumentation, it MUST set the `http.request.method` attribute to `other` and SHOULD
+          populate the exact method passed by client on `http.request.original_method` attribute.
+
+          HTTP method names are case-sensitive and `http.request.method` attribute value MUST match a standard (or documented elsewhere) HTTP method name exactly.      
+      - id: request.original_method
+        type: string
+        requirement_level:
+          recommended: If and only if it's different than `http.request.method`.
+        brief: Original HTTP method sent by the client in the request line.
+        examples: ["GeT", "ACL", "foo"]
       - id: response.status_code
         type: int
         requirement_level:
@@ -25,7 +72,7 @@ groups:
   - id: attributes.http.client
     prefix: http
     type: attribute_group
-    brief: 'HTTP Client spans attributes'
+    brief: 'HTTP Client attributes'
     attributes:
       - ref: server.address
         requirement_level: required
@@ -51,7 +98,7 @@ groups:
   - id: attributes.http.server
     prefix: http
     type: attribute_group
-    brief: 'HTTP Server spans attributes'
+    brief: 'HTTP Server attributes'
     attributes:
       - id: route
         type: string
diff --git a/specification/metrics/semantic_conventions/http-metrics.md b/specification/metrics/semantic_conventions/http-metrics.md
index ca43d975f4..9ddcd6d9cc 100644
--- a/specification/metrics/semantic_conventions/http-metrics.md
+++ b/specification/metrics/semantic_conventions/http-metrics.md
@@ -70,20 +70,29 @@ of `[ 0, 0.005, 0.01, 0.025, 0.05, 0.075, 0.1, 0.25, 0.5, 0.75, 1, 2.5, 5, 7.5,
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
 | `http.route` | string | The matched route (path template in the format used by the respective server framework). See note below [1] | `/users/:userID?`; `{controller}/{action}/{id?}` | Conditionally Required: If and only if it's available |
-| `http.request.method` | string | HTTP request method. | `GET`; `POST`; `HEAD` | Required |
+| `http.request.method` | string | HTTP request method. [2] | `GET`; `POST`; `HEAD` | Required |
 | `http.response.status_code` | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
 | [`network.protocol.name`](../../trace/semantic_conventions/span-general.md) | string | [OSI Application Layer](https://osi-model.com/application-layer/) or non-OSI equivalent. The value SHOULD be normalized to lowercase. | `amqp`; `http`; `mqtt` | Recommended |
-| [`network.protocol.version`](../../trace/semantic_conventions/span-general.md) | string | Version of the application layer protocol used. See note below. [2] | `3.1.1` | Recommended |
-| [`server.address`](../../trace/semantic_conventions/span-general.md) | string | Name of the local HTTP server that received the request. [3] | `example.com` | Required |
-| [`server.port`](../../trace/semantic_conventions/span-general.md) | int | Port of the local HTTP server that received the request. [4] | `80`; `8080`; `443` | Conditionally Required: [5] |
+| [`network.protocol.version`](../../trace/semantic_conventions/span-general.md) | string | Version of the application layer protocol used. See note below. [3] | `3.1.1` | Recommended |
+| [`server.address`](../../trace/semantic_conventions/span-general.md) | string | Name of the local HTTP server that received the request. [4] | `example.com` | Required |
+| [`server.port`](../../trace/semantic_conventions/span-general.md) | int | Port of the local HTTP server that received the request. [5] | `80`; `8080`; `443` | Conditionally Required: [6] |
 | `url.scheme` | string | The [URI scheme](https://www.rfc-editor.org/rfc/rfc3986#section-3.1) component identifying the used protocol. | `http`; `https` | Required |
 
 **[1]:** MUST NOT be populated when this is not supported by the HTTP server framework as the route attribute should have low-cardinality and the URI path can NOT substitute it.
 SHOULD include the [application root](/specification/trace/semantic_conventions/http.md#http-server-definitions) if there is one.
 
-**[2]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+**[2]:** HTTP request method SHOULD be one of the methods defined in [RFC9110](https://www.rfc-editor.org/rfc/rfc9110.html#name-methods)
+or the PATCH method defined in [RFC5789](https://www.rfc-editor.org/rfc/rfc5789.html).
+Instrumentation MAY additionally support the closed set of custom HTTP methods defined in
+[HTTP method registry](https://www.iana.org/assignments/http-methods/http-methods.xhtml) or a private registry.
+If the HTTP request method is not known to the instrumentation, it MUST set the `http.request.method` attribute to `other` and SHOULD
+populate the exact method passed by client on `http.request.original_method` attribute.
 
-**[3]:** Determined by using the first of the following that applies
+HTTP method names are case-sensitive and `http.request.method` attribute value MUST match a standard (or documented elsewhere) HTTP method name exactly.
+
+**[3]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+
+**[4]:** Determined by using the first of the following that applies
 
 - The [primary server name](/specification/trace/semantic_conventions/http.md#http-server-definitions) of the matched virtual host. MUST only
   include host identifier.
@@ -93,14 +102,29 @@ SHOULD include the [application root](/specification/trace/semantic_conventions/
 
 SHOULD NOT be set if only IP address is available and capturing name would require a reverse DNS lookup.
 
-**[4]:** Determined by using the first of the following that applies
+**[5]:** Determined by using the first of the following that applies
 
 - Port identifier of the [primary server host](/specification/trace/semantic_conventions/http.md#http-server-definitions) of the matched virtual host.
 - Port identifier of the [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource)
   if it's sent in absolute-form.
 - Port identifier of the `Host` header
 
-**[5]:** If not default (`80` for `http` scheme, `443` for `https`).
+**[6]:** If not default (`80` for `http` scheme, `443` for `https`).
+
+`http.request.method` has the following list of well-known values. If one of them applies, then the respective value MUST be used, otherwise a custom value MAY be used.
+
+| Value  | Description |
+|---|---|
+| `CONNECT` | CONNECT method. |
+| `DELETE` | DELETE method. |
+| `GET` | GET method. |
+| `HEAD` | HEAD method. |
+| `OPTIONS` | OPTIONS method. |
+| `PATCH` | PATCH method. |
+| `POST` | POST method. |
+| `PUT` | PUT method. |
+| `TRACE` | TRACE method. |
+| `other` | Any custom HTTP method that the instrumentation has no prior knowledge of. |
 <!-- endsemconv -->
 
 ### Metric: `http.server.active_requests`
@@ -116,12 +140,21 @@ This metric is optional.
 <!-- semconv metric.http.server.active_requests(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
-| `http.request.method` | string | HTTP request method. | `GET`; `POST`; `HEAD` | Required |
-| [`server.address`](../../trace/semantic_conventions/span-general.md) | string | Name of the local HTTP server that received the request. [1] | `example.com` | Required |
-| [`server.port`](../../trace/semantic_conventions/span-general.md) | int | Port of the local HTTP server that received the request. [2] | `80`; `8080`; `443` | Conditionally Required: [3] |
+| `http.request.method` | string | HTTP request method. [1] | `GET`; `POST`; `HEAD` | Required |
+| [`server.address`](../../trace/semantic_conventions/span-general.md) | string | Name of the local HTTP server that received the request. [2] | `example.com` | Required |
+| [`server.port`](../../trace/semantic_conventions/span-general.md) | int | Port of the local HTTP server that received the request. [3] | `80`; `8080`; `443` | Conditionally Required: [4] |
 | `url.scheme` | string | The [URI scheme](https://www.rfc-editor.org/rfc/rfc3986#section-3.1) component identifying the used protocol. | `http`; `https` | Required |
 
-**[1]:** Determined by using the first of the following that applies
+**[1]:** HTTP request method SHOULD be one of the methods defined in [RFC9110](https://www.rfc-editor.org/rfc/rfc9110.html#name-methods)
+or the PATCH method defined in [RFC5789](https://www.rfc-editor.org/rfc/rfc5789.html).
+Instrumentation MAY additionally support the closed set of custom HTTP methods defined in
+[HTTP method registry](https://www.iana.org/assignments/http-methods/http-methods.xhtml) or a private registry.
+If the HTTP request method is not known to the instrumentation, it MUST set the `http.request.method` attribute to `other` and SHOULD
+populate the exact method passed by client on `http.request.original_method` attribute.
+
+HTTP method names are case-sensitive and `http.request.method` attribute value MUST match a standard (or documented elsewhere) HTTP method name exactly.
+
+**[2]:** Determined by using the first of the following that applies
 
 - The [primary server name](/specification/trace/semantic_conventions/http.md#http-server-definitions) of the matched virtual host. MUST only
   include host identifier.
@@ -131,14 +164,29 @@ This metric is optional.
 
 SHOULD NOT be set if only IP address is available and capturing name would require a reverse DNS lookup.
 
-**[2]:** Determined by using the first of the following that applies
+**[3]:** Determined by using the first of the following that applies
 
 - Port identifier of the [primary server host](/specification/trace/semantic_conventions/http.md#http-server-definitions) of the matched virtual host.
 - Port identifier of the [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource)
   if it's sent in absolute-form.
 - Port identifier of the `Host` header
 
-**[3]:** If not default (`80` for `http` scheme, `443` for `https`).
+**[4]:** If not default (`80` for `http` scheme, `443` for `https`).
+
+`http.request.method` has the following list of well-known values. If one of them applies, then the respective value MUST be used, otherwise a custom value MAY be used.
+
+| Value  | Description |
+|---|---|
+| `CONNECT` | CONNECT method. |
+| `DELETE` | DELETE method. |
+| `GET` | GET method. |
+| `HEAD` | HEAD method. |
+| `OPTIONS` | OPTIONS method. |
+| `PATCH` | PATCH method. |
+| `POST` | POST method. |
+| `PUT` | PUT method. |
+| `TRACE` | TRACE method. |
+| `other` | Any custom HTTP method that the instrumentation has no prior knowledge of. |
 <!-- endsemconv -->
 
 ### Metric: `http.server.request.size`
@@ -155,20 +203,29 @@ This metric is optional.
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
 | `http.route` | string | The matched route (path template in the format used by the respective server framework). See note below [1] | `/users/:userID?`; `{controller}/{action}/{id?}` | Conditionally Required: If and only if it's available |
-| `http.request.method` | string | HTTP request method. | `GET`; `POST`; `HEAD` | Required |
+| `http.request.method` | string | HTTP request method. [2] | `GET`; `POST`; `HEAD` | Required |
 | `http.response.status_code` | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
 | [`network.protocol.name`](../../trace/semantic_conventions/span-general.md) | string | [OSI Application Layer](https://osi-model.com/application-layer/) or non-OSI equivalent. The value SHOULD be normalized to lowercase. | `amqp`; `http`; `mqtt` | Recommended |
-| [`network.protocol.version`](../../trace/semantic_conventions/span-general.md) | string | Version of the application layer protocol used. See note below. [2] | `3.1.1` | Recommended |
-| [`server.address`](../../trace/semantic_conventions/span-general.md) | string | Name of the local HTTP server that received the request. [3] | `example.com` | Required |
-| [`server.port`](../../trace/semantic_conventions/span-general.md) | int | Port of the local HTTP server that received the request. [4] | `80`; `8080`; `443` | Conditionally Required: [5] |
+| [`network.protocol.version`](../../trace/semantic_conventions/span-general.md) | string | Version of the application layer protocol used. See note below. [3] | `3.1.1` | Recommended |
+| [`server.address`](../../trace/semantic_conventions/span-general.md) | string | Name of the local HTTP server that received the request. [4] | `example.com` | Required |
+| [`server.port`](../../trace/semantic_conventions/span-general.md) | int | Port of the local HTTP server that received the request. [5] | `80`; `8080`; `443` | Conditionally Required: [6] |
 | `url.scheme` | string | The [URI scheme](https://www.rfc-editor.org/rfc/rfc3986#section-3.1) component identifying the used protocol. | `http`; `https` | Required |
 
 **[1]:** MUST NOT be populated when this is not supported by the HTTP server framework as the route attribute should have low-cardinality and the URI path can NOT substitute it.
 SHOULD include the [application root](/specification/trace/semantic_conventions/http.md#http-server-definitions) if there is one.
 
-**[2]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+**[2]:** HTTP request method SHOULD be one of the methods defined in [RFC9110](https://www.rfc-editor.org/rfc/rfc9110.html#name-methods)
+or the PATCH method defined in [RFC5789](https://www.rfc-editor.org/rfc/rfc5789.html).
+Instrumentation MAY additionally support the closed set of custom HTTP methods defined in
+[HTTP method registry](https://www.iana.org/assignments/http-methods/http-methods.xhtml) or a private registry.
+If the HTTP request method is not known to the instrumentation, it MUST set the `http.request.method` attribute to `other` and SHOULD
+populate the exact method passed by client on `http.request.original_method` attribute.
 
-**[3]:** Determined by using the first of the following that applies
+HTTP method names are case-sensitive and `http.request.method` attribute value MUST match a standard (or documented elsewhere) HTTP method name exactly.
+
+**[3]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+
+**[4]:** Determined by using the first of the following that applies
 
 - The [primary server name](/specification/trace/semantic_conventions/http.md#http-server-definitions) of the matched virtual host. MUST only
   include host identifier.
@@ -178,14 +235,29 @@ SHOULD include the [application root](/specification/trace/semantic_conventions/
 
 SHOULD NOT be set if only IP address is available and capturing name would require a reverse DNS lookup.
 
-**[4]:** Determined by using the first of the following that applies
+**[5]:** Determined by using the first of the following that applies
 
 - Port identifier of the [primary server host](/specification/trace/semantic_conventions/http.md#http-server-definitions) of the matched virtual host.
 - Port identifier of the [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource)
   if it's sent in absolute-form.
 - Port identifier of the `Host` header
 
-**[5]:** If not default (`80` for `http` scheme, `443` for `https`).
+**[6]:** If not default (`80` for `http` scheme, `443` for `https`).
+
+`http.request.method` has the following list of well-known values. If one of them applies, then the respective value MUST be used, otherwise a custom value MAY be used.
+
+| Value  | Description |
+|---|---|
+| `CONNECT` | CONNECT method. |
+| `DELETE` | DELETE method. |
+| `GET` | GET method. |
+| `HEAD` | HEAD method. |
+| `OPTIONS` | OPTIONS method. |
+| `PATCH` | PATCH method. |
+| `POST` | POST method. |
+| `PUT` | PUT method. |
+| `TRACE` | TRACE method. |
+| `other` | Any custom HTTP method that the instrumentation has no prior knowledge of. |
 <!-- endsemconv -->
 
 ### Metric: `http.server.response.size`
@@ -202,20 +274,29 @@ This metric is optional.
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
 | `http.route` | string | The matched route (path template in the format used by the respective server framework). See note below [1] | `/users/:userID?`; `{controller}/{action}/{id?}` | Conditionally Required: If and only if it's available |
-| `http.request.method` | string | HTTP request method. | `GET`; `POST`; `HEAD` | Required |
+| `http.request.method` | string | HTTP request method. [2] | `GET`; `POST`; `HEAD` | Required |
 | `http.response.status_code` | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
 | [`network.protocol.name`](../../trace/semantic_conventions/span-general.md) | string | [OSI Application Layer](https://osi-model.com/application-layer/) or non-OSI equivalent. The value SHOULD be normalized to lowercase. | `amqp`; `http`; `mqtt` | Recommended |
-| [`network.protocol.version`](../../trace/semantic_conventions/span-general.md) | string | Version of the application layer protocol used. See note below. [2] | `3.1.1` | Recommended |
-| [`server.address`](../../trace/semantic_conventions/span-general.md) | string | Name of the local HTTP server that received the request. [3] | `example.com` | Required |
-| [`server.port`](../../trace/semantic_conventions/span-general.md) | int | Port of the local HTTP server that received the request. [4] | `80`; `8080`; `443` | Conditionally Required: [5] |
+| [`network.protocol.version`](../../trace/semantic_conventions/span-general.md) | string | Version of the application layer protocol used. See note below. [3] | `3.1.1` | Recommended |
+| [`server.address`](../../trace/semantic_conventions/span-general.md) | string | Name of the local HTTP server that received the request. [4] | `example.com` | Required |
+| [`server.port`](../../trace/semantic_conventions/span-general.md) | int | Port of the local HTTP server that received the request. [5] | `80`; `8080`; `443` | Conditionally Required: [6] |
 | `url.scheme` | string | The [URI scheme](https://www.rfc-editor.org/rfc/rfc3986#section-3.1) component identifying the used protocol. | `http`; `https` | Required |
 
 **[1]:** MUST NOT be populated when this is not supported by the HTTP server framework as the route attribute should have low-cardinality and the URI path can NOT substitute it.
 SHOULD include the [application root](/specification/trace/semantic_conventions/http.md#http-server-definitions) if there is one.
 
-**[2]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+**[2]:** HTTP request method SHOULD be one of the methods defined in [RFC9110](https://www.rfc-editor.org/rfc/rfc9110.html#name-methods)
+or the PATCH method defined in [RFC5789](https://www.rfc-editor.org/rfc/rfc5789.html).
+Instrumentation MAY additionally support the closed set of custom HTTP methods defined in
+[HTTP method registry](https://www.iana.org/assignments/http-methods/http-methods.xhtml) or a private registry.
+If the HTTP request method is not known to the instrumentation, it MUST set the `http.request.method` attribute to `other` and SHOULD
+populate the exact method passed by client on `http.request.original_method` attribute.
 
-**[3]:** Determined by using the first of the following that applies
+HTTP method names are case-sensitive and `http.request.method` attribute value MUST match a standard (or documented elsewhere) HTTP method name exactly.
+
+**[3]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+
+**[4]:** Determined by using the first of the following that applies
 
 - The [primary server name](/specification/trace/semantic_conventions/http.md#http-server-definitions) of the matched virtual host. MUST only
   include host identifier.
@@ -225,14 +306,29 @@ SHOULD include the [application root](/specification/trace/semantic_conventions/
 
 SHOULD NOT be set if only IP address is available and capturing name would require a reverse DNS lookup.
 
-**[4]:** Determined by using the first of the following that applies
+**[5]:** Determined by using the first of the following that applies
 
 - Port identifier of the [primary server host](/specification/trace/semantic_conventions/http.md#http-server-definitions) of the matched virtual host.
 - Port identifier of the [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource)
   if it's sent in absolute-form.
 - Port identifier of the `Host` header
 
-**[5]:** If not default (`80` for `http` scheme, `443` for `https`).
+**[6]:** If not default (`80` for `http` scheme, `443` for `https`).
+
+`http.request.method` has the following list of well-known values. If one of them applies, then the respective value MUST be used, otherwise a custom value MAY be used.
+
+| Value  | Description |
+|---|---|
+| `CONNECT` | CONNECT method. |
+| `DELETE` | DELETE method. |
+| `GET` | GET method. |
+| `HEAD` | HEAD method. |
+| `OPTIONS` | OPTIONS method. |
+| `PATCH` | PATCH method. |
+| `POST` | POST method. |
+| `PUT` | PUT method. |
+| `TRACE` | TRACE method. |
+| `other` | Any custom HTTP method that the instrumentation has no prior knowledge of. |
 <!-- endsemconv -->
 
 ## HTTP Client
@@ -254,17 +350,26 @@ of `[ 0, 0.005, 0.01, 0.025, 0.05, 0.075, 0.1, 0.25, 0.5, 0.75, 1, 2.5, 5, 7.5,
 <!-- semconv metric.http.client.duration(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
-| `http.request.method` | string | HTTP request method. | `GET`; `POST`; `HEAD` | Required |
+| `http.request.method` | string | HTTP request method. [1] | `GET`; `POST`; `HEAD` | Required |
 | `http.response.status_code` | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
 | [`network.protocol.name`](../../trace/semantic_conventions/span-general.md) | string | [OSI Application Layer](https://osi-model.com/application-layer/) or non-OSI equivalent. The value SHOULD be normalized to lowercase. | `amqp`; `http`; `mqtt` | Recommended |
-| [`network.protocol.version`](../../trace/semantic_conventions/span-general.md) | string | Version of the application layer protocol used. See note below. [1] | `3.1.1` | Recommended |
-| [`server.address`](../../trace/semantic_conventions/span-general.md) | string | Host identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [2] | `example.com` | Required |
-| [`server.port`](../../trace/semantic_conventions/span-general.md) | int | Port identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [3] | `80`; `8080`; `443` | Conditionally Required: [4] |
+| [`network.protocol.version`](../../trace/semantic_conventions/span-general.md) | string | Version of the application layer protocol used. See note below. [2] | `3.1.1` | Recommended |
+| [`server.address`](../../trace/semantic_conventions/span-general.md) | string | Host identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [3] | `example.com` | Required |
+| [`server.port`](../../trace/semantic_conventions/span-general.md) | int | Port identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [4] | `80`; `8080`; `443` | Conditionally Required: [5] |
 | [`server.socket.address`](../../trace/semantic_conventions/span-general.md) | string | Physical server IP address or Unix socket address. | `10.5.3.2` | Recommended: If different than `server.address`. |
 
-**[1]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+**[1]:** HTTP request method SHOULD be one of the methods defined in [RFC9110](https://www.rfc-editor.org/rfc/rfc9110.html#name-methods)
+or the PATCH method defined in [RFC5789](https://www.rfc-editor.org/rfc/rfc5789.html).
+Instrumentation MAY additionally support the closed set of custom HTTP methods defined in
+[HTTP method registry](https://www.iana.org/assignments/http-methods/http-methods.xhtml) or a private registry.
+If the HTTP request method is not known to the instrumentation, it MUST set the `http.request.method` attribute to `other` and SHOULD
+populate the exact method passed by client on `http.request.original_method` attribute.
 
-**[2]:** Determined by using the first of the following that applies
+HTTP method names are case-sensitive and `http.request.method` attribute value MUST match a standard (or documented elsewhere) HTTP method name exactly.
+
+**[2]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+
+**[3]:** Determined by using the first of the following that applies
 
 - Host identifier of the [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource)
   if it's sent in absolute-form
@@ -272,9 +377,24 @@ of `[ 0, 0.005, 0.01, 0.025, 0.05, 0.075, 0.1, 0.25, 0.5, 0.75, 1, 2.5, 5, 7.5,
 
 SHOULD NOT be set if capturing it would require an extra DNS lookup.
 
-**[3]:** When [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource) is absolute URI, `server.port` MUST match URI port identifier, otherwise it MUST match `Host` header port identifier.
+**[4]:** When [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource) is absolute URI, `server.port` MUST match URI port identifier, otherwise it MUST match `Host` header port identifier.
 
-**[4]:** If not default (`80` for `http` scheme, `443` for `https`).
+**[5]:** If not default (`80` for `http` scheme, `443` for `https`).
+
+`http.request.method` has the following list of well-known values. If one of them applies, then the respective value MUST be used, otherwise a custom value MAY be used.
+
+| Value  | Description |
+|---|---|
+| `CONNECT` | CONNECT method. |
+| `DELETE` | DELETE method. |
+| `GET` | GET method. |
+| `HEAD` | HEAD method. |
+| `OPTIONS` | OPTIONS method. |
+| `PATCH` | PATCH method. |
+| `POST` | POST method. |
+| `PUT` | PUT method. |
+| `TRACE` | TRACE method. |
+| `other` | Any custom HTTP method that the instrumentation has no prior knowledge of. |
 <!-- endsemconv -->
 
 ### Metric: `http.client.request.size`
@@ -290,17 +410,26 @@ This metric is optional.
 <!-- semconv metric.http.client.request.size(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
-| `http.request.method` | string | HTTP request method. | `GET`; `POST`; `HEAD` | Required |
+| `http.request.method` | string | HTTP request method. [1] | `GET`; `POST`; `HEAD` | Required |
 | `http.response.status_code` | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
 | [`network.protocol.name`](../../trace/semantic_conventions/span-general.md) | string | [OSI Application Layer](https://osi-model.com/application-layer/) or non-OSI equivalent. The value SHOULD be normalized to lowercase. | `amqp`; `http`; `mqtt` | Recommended |
-| [`network.protocol.version`](../../trace/semantic_conventions/span-general.md) | string | Version of the application layer protocol used. See note below. [1] | `3.1.1` | Recommended |
-| [`server.address`](../../trace/semantic_conventions/span-general.md) | string | Host identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [2] | `example.com` | Required |
-| [`server.port`](../../trace/semantic_conventions/span-general.md) | int | Port identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [3] | `80`; `8080`; `443` | Conditionally Required: [4] |
+| [`network.protocol.version`](../../trace/semantic_conventions/span-general.md) | string | Version of the application layer protocol used. See note below. [2] | `3.1.1` | Recommended |
+| [`server.address`](../../trace/semantic_conventions/span-general.md) | string | Host identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [3] | `example.com` | Required |
+| [`server.port`](../../trace/semantic_conventions/span-general.md) | int | Port identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [4] | `80`; `8080`; `443` | Conditionally Required: [5] |
 | [`server.socket.address`](../../trace/semantic_conventions/span-general.md) | string | Physical server IP address or Unix socket address. | `10.5.3.2` | Recommended: If different than `server.address`. |
 
-**[1]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+**[1]:** HTTP request method SHOULD be one of the methods defined in [RFC9110](https://www.rfc-editor.org/rfc/rfc9110.html#name-methods)
+or the PATCH method defined in [RFC5789](https://www.rfc-editor.org/rfc/rfc5789.html).
+Instrumentation MAY additionally support the closed set of custom HTTP methods defined in
+[HTTP method registry](https://www.iana.org/assignments/http-methods/http-methods.xhtml) or a private registry.
+If the HTTP request method is not known to the instrumentation, it MUST set the `http.request.method` attribute to `other` and SHOULD
+populate the exact method passed by client on `http.request.original_method` attribute.
 
-**[2]:** Determined by using the first of the following that applies
+HTTP method names are case-sensitive and `http.request.method` attribute value MUST match a standard (or documented elsewhere) HTTP method name exactly.
+
+**[2]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+
+**[3]:** Determined by using the first of the following that applies
 
 - Host identifier of the [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource)
   if it's sent in absolute-form
@@ -308,9 +437,24 @@ This metric is optional.
 
 SHOULD NOT be set if capturing it would require an extra DNS lookup.
 
-**[3]:** When [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource) is absolute URI, `server.port` MUST match URI port identifier, otherwise it MUST match `Host` header port identifier.
+**[4]:** When [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource) is absolute URI, `server.port` MUST match URI port identifier, otherwise it MUST match `Host` header port identifier.
 
-**[4]:** If not default (`80` for `http` scheme, `443` for `https`).
+**[5]:** If not default (`80` for `http` scheme, `443` for `https`).
+
+`http.request.method` has the following list of well-known values. If one of them applies, then the respective value MUST be used, otherwise a custom value MAY be used.
+
+| Value  | Description |
+|---|---|
+| `CONNECT` | CONNECT method. |
+| `DELETE` | DELETE method. |
+| `GET` | GET method. |
+| `HEAD` | HEAD method. |
+| `OPTIONS` | OPTIONS method. |
+| `PATCH` | PATCH method. |
+| `POST` | POST method. |
+| `PUT` | PUT method. |
+| `TRACE` | TRACE method. |
+| `other` | Any custom HTTP method that the instrumentation has no prior knowledge of. |
 <!-- endsemconv -->
 
 ### Metric: `http.client.response.size`
@@ -326,17 +470,26 @@ This metric is optional.
 <!-- semconv metric.http.client.response.size(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
-| `http.request.method` | string | HTTP request method. | `GET`; `POST`; `HEAD` | Required |
+| `http.request.method` | string | HTTP request method. [1] | `GET`; `POST`; `HEAD` | Required |
 | `http.response.status_code` | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
 | [`network.protocol.name`](../../trace/semantic_conventions/span-general.md) | string | [OSI Application Layer](https://osi-model.com/application-layer/) or non-OSI equivalent. The value SHOULD be normalized to lowercase. | `amqp`; `http`; `mqtt` | Recommended |
-| [`network.protocol.version`](../../trace/semantic_conventions/span-general.md) | string | Version of the application layer protocol used. See note below. [1] | `3.1.1` | Recommended |
-| [`server.address`](../../trace/semantic_conventions/span-general.md) | string | Host identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [2] | `example.com` | Required |
-| [`server.port`](../../trace/semantic_conventions/span-general.md) | int | Port identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [3] | `80`; `8080`; `443` | Conditionally Required: [4] |
+| [`network.protocol.version`](../../trace/semantic_conventions/span-general.md) | string | Version of the application layer protocol used. See note below. [2] | `3.1.1` | Recommended |
+| [`server.address`](../../trace/semantic_conventions/span-general.md) | string | Host identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [3] | `example.com` | Required |
+| [`server.port`](../../trace/semantic_conventions/span-general.md) | int | Port identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [4] | `80`; `8080`; `443` | Conditionally Required: [5] |
 | [`server.socket.address`](../../trace/semantic_conventions/span-general.md) | string | Physical server IP address or Unix socket address. | `10.5.3.2` | Recommended: If different than `server.address`. |
 
-**[1]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+**[1]:** HTTP request method SHOULD be one of the methods defined in [RFC9110](https://www.rfc-editor.org/rfc/rfc9110.html#name-methods)
+or the PATCH method defined in [RFC5789](https://www.rfc-editor.org/rfc/rfc5789.html).
+Instrumentation MAY additionally support the closed set of custom HTTP methods defined in
+[HTTP method registry](https://www.iana.org/assignments/http-methods/http-methods.xhtml) or a private registry.
+If the HTTP request method is not known to the instrumentation, it MUST set the `http.request.method` attribute to `other` and SHOULD
+populate the exact method passed by client on `http.request.original_method` attribute.
 
-**[2]:** Determined by using the first of the following that applies
+HTTP method names are case-sensitive and `http.request.method` attribute value MUST match a standard (or documented elsewhere) HTTP method name exactly.
+
+**[2]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+
+**[3]:** Determined by using the first of the following that applies
 
 - Host identifier of the [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource)
   if it's sent in absolute-form
@@ -344,7 +497,22 @@ This metric is optional.
 
 SHOULD NOT be set if capturing it would require an extra DNS lookup.
 
-**[3]:** When [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource) is absolute URI, `server.port` MUST match URI port identifier, otherwise it MUST match `Host` header port identifier.
+**[4]:** When [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource) is absolute URI, `server.port` MUST match URI port identifier, otherwise it MUST match `Host` header port identifier.
 
-**[4]:** If not default (`80` for `http` scheme, `443` for `https`).
+**[5]:** If not default (`80` for `http` scheme, `443` for `https`).
+
+`http.request.method` has the following list of well-known values. If one of them applies, then the respective value MUST be used, otherwise a custom value MAY be used.
+
+| Value  | Description |
+|---|---|
+| `CONNECT` | CONNECT method. |
+| `DELETE` | DELETE method. |
+| `GET` | GET method. |
+| `HEAD` | HEAD method. |
+| `OPTIONS` | OPTIONS method. |
+| `PATCH` | PATCH method. |
+| `POST` | POST method. |
+| `PUT` | PUT method. |
+| `TRACE` | TRACE method. |
+| `other` | Any custom HTTP method that the instrumentation has no prior knowledge of. |
 <!-- endsemconv -->
diff --git a/specification/trace/semantic_conventions/http.md b/specification/trace/semantic_conventions/http.md
index c1b9c543b7..fedee88b30 100644
--- a/specification/trace/semantic_conventions/http.md
+++ b/specification/trace/semantic_conventions/http.md
@@ -89,24 +89,51 @@ sections below.
 <!-- semconv trace.http.common(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
+| `http.request.original_method` | string | Original HTTP method sent by the client in the request line. | `GeT`; `ACL`; `foo` | Recommended: [1] |
 | `http.response.status_code` | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
 | `http.request.body.size` | int | The size of the request payload body in bytes. This is the number of bytes transferred excluding headers and is often, but not always, present as the [Content-Length](https://www.rfc-editor.org/rfc/rfc9110.html#field.content-length) header. For requests using transport encoding, this should be the compressed size. | `3495` | Recommended |
 | `http.response.body.size` | int | The size of the response payload body in bytes. This is the number of bytes transferred excluding headers and is often, but not always, present as the [Content-Length](https://www.rfc-editor.org/rfc/rfc9110.html#field.content-length) header. For requests using transport encoding, this should be the compressed size. | `3495` | Recommended |
-| `http.request.method` | string | HTTP request method. | `GET`; `POST`; `HEAD` | Required |
+| `http.request.method` | string | HTTP request method. [2] | `GET`; `POST`; `HEAD` | Required |
 | [`network.protocol.name`](span-general.md) | string | [OSI Application Layer](https://osi-model.com/application-layer/) or non-OSI equivalent. The value SHOULD be normalized to lowercase. | `http`; `spdy` | Recommended: if not default (`http`). |
-| [`network.protocol.version`](span-general.md) | string | Version of the application layer protocol used. See note below. [1] | `1.0`; `1.1`; `2.0` | Recommended |
-| [`network.transport`](span-general.md) | string | [OSI Transport Layer](https://osi-model.com/transport-layer/) or [Inter-process Communication method](https://en.wikipedia.org/wiki/Inter-process_communication). The value SHOULD be normalized to lowercase. | `tcp`; `udp` | Conditionally Required: [2] |
+| [`network.protocol.version`](span-general.md) | string | Version of the application layer protocol used. See note below. [3] | `1.0`; `1.1`; `2.0` | Recommended |
+| [`network.transport`](span-general.md) | string | [OSI Transport Layer](https://osi-model.com/transport-layer/) or [Inter-process Communication method](https://en.wikipedia.org/wiki/Inter-process_communication). The value SHOULD be normalized to lowercase. | `tcp`; `udp` | Conditionally Required: [4] |
 | [`network.type`](span-general.md) | string | [OSI Network Layer](https://osi-model.com/network-layer/) or non-OSI equivalent. The value SHOULD be normalized to lowercase. | `ipv4`; `ipv6` | Recommended |
 | `user_agent.original` | string | Value of the [HTTP User-Agent](https://www.rfc-editor.org/rfc/rfc9110.html#field.user-agent) header sent by the client. | `CERN-LineMode/2.15 libwww/2.17b3` | Recommended |
 
-**[1]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+**[1]:** If and only if it's different than `http.request.method`.
 
-**[2]:** If not default (`tcp` for `HTTP/1.1` and `HTTP/2`, `udp` for `HTTP/3`).
+**[2]:** HTTP request method SHOULD be one of the methods defined in [RFC9110](https://www.rfc-editor.org/rfc/rfc9110.html#name-methods)
+or the PATCH method defined in [RFC5789](https://www.rfc-editor.org/rfc/rfc5789.html).
+Instrumentation MAY additionally support the closed set of custom HTTP methods defined in
+[HTTP method registry](https://www.iana.org/assignments/http-methods/http-methods.xhtml) or a private registry.
+If the HTTP request method is not known to the instrumentation, it MUST set the `http.request.method` attribute to `other` and SHOULD
+populate the exact method passed by client on `http.request.original_method` attribute.
+
+HTTP method names are case-sensitive and `http.request.method` attribute value MUST match a standard (or documented elsewhere) HTTP method name exactly.
+
+**[3]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+
+**[4]:** If not default (`tcp` for `HTTP/1.1` and `HTTP/2`, `udp` for `HTTP/3`).
 
 Following attributes MUST be provided **at span creation time** (when provided at all), so they can be considered for sampling decisions:
 
 * `http.request.method`
 
+`http.request.method` has the following list of well-known values. If one of them applies, then the respective value MUST be used, otherwise a custom value MAY be used.
+
+| Value  | Description |
+|---|---|
+| `CONNECT` | CONNECT method. |
+| `DELETE` | DELETE method. |
+| `GET` | GET method. |
+| `HEAD` | HEAD method. |
+| `OPTIONS` | OPTIONS method. |
+| `PATCH` | PATCH method. |
+| `POST` | POST method. |
+| `PUT` | PUT method. |
+| `TRACE` | TRACE method. |
+| `other` | Any custom HTTP method that the instrumentation has no prior knowledge of. |
+
 `network.transport` has the following list of well-known values. If one of them applies, then the respective value MUST be used, otherwise a custom value MAY be used.
 
 | Value  | Description |