diff --git a/pkgs/http_profile/lib/http_profile.dart b/pkgs/http_profile/lib/http_profile.dart
index ea27665fb1..98fc2fcf2b 100644
--- a/pkgs/http_profile/lib/http_profile.dart
+++ b/pkgs/http_profile/lib/http_profile.dart
@@ -2,8 +2,208 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+import 'dart:async' show StreamController, StreamSink;
+import 'dart:developer' show addHttpClientProfilingData, Timeline;
 import 'dart:io';
 
+/// Describes an event related to an HTTP request.
+final class HttpProfileRequestEvent {
+  final int _timestamp;
+  final String _name;
+
+  /// [timestamp] should be the time at which the event occurred, as a
+  /// microsecond value on the monotonic clock used by the [Timeline].
+  HttpProfileRequestEvent({required int timestamp, required String name})
+      : _timestamp = timestamp,
+        _name = name;
+
+  Map<String, dynamic> _toJson() => <String, dynamic>{
+        'timestamp': _timestamp,
+        'event': _name,
+      };
+}
+
+/// Describes proxy authentication details associated with an HTTP request.
+final class HttpProfileProxyData {
+  final String? _host;
+  final String? _username;
+  final bool? _isDirect;
+  final int? _port;
+
+  HttpProfileProxyData(
+      {String? host, String? username, bool? isDirect, int? port})
+      : _host = host,
+        _username = username,
+        _isDirect = isDirect,
+        _port = port;
+
+  Map<String, dynamic> _toJson() => <String, dynamic>{
+        if (_host != null) 'host': _host,
+        if (_username != null) 'username': _username,
+        if (_isDirect != null) 'isDirect': _isDirect,
+        if (_port != null) 'port': _port,
+      };
+}
+
+/// Describes details about an HTTP request.
+final class HttpProfileRequestData {
+  final Map<String, dynamic> _data;
+
+  final void Function() _updated;
+
+  /// The elements of [connectionInfo] can either be [String]s or [int]s.
+  set connectionInfo(Map<String, dynamic /*String|int*/ > value) {
+    _data['connectionInfo'] = value;
+    _updated();
+  }
+
+  /// The content length of the request, in bytes.
+  set contentLength(int value) {
+    _data['contentLength'] = value;
+    _updated();
+  }
+
+  /// The cookies presented to the server (in the 'cookie' header).
+  set cookies(List<String> value) {
+    _data['cookies'] = value;
+    _updated();
+  }
+
+  /// The error associated with the failed request.
+  set error(String value) {
+    _data['error'] = value;
+    _updated();
+  }
+
+  /// Whether redirects were followed automatically.
+  set followRedirects(bool value) {
+    _data['followRedirects'] = value;
+    _updated();
+  }
+
+  set headers(Map<String, List<String>> value) {
+    _data['headers'] = value;
+    _updated();
+  }
+
+  /// If [followRedirects] is true, this is the maximum number of redirects that
+  /// were followed.
+  set maxRedirects(int value) {
+    _data['maxRedirects'] = value;
+    _updated();
+  }
+
+  /// The requested persistent connection state.
+  set persistentConnection(bool value) {
+    _data['persistentConnection'] = value;
+    _updated();
+  }
+
+  /// Proxy authentication details for the request.
+  set proxyDetails(HttpProfileProxyData value) {
+    _data['proxyDetails'] = value._toJson();
+    _updated();
+  }
+
+  HttpProfileRequestData._(
+      Map<String, dynamic> this._data, void Function() this._updated);
+}
+
+/// Describes details about a response to an HTTP request.
+final class HttpProfileResponseData {
+  final Map<String, dynamic> _data;
+
+  final void Function() _updated;
+
+  /// Records a redirect that the connection went through. The elements of
+  /// [redirect] can either be [String]s or [int]s.
+  void addRedirect(Map<String, dynamic /*String|int*/ > redirect) {
+    _data['redirects'].add(redirect);
+    _updated();
+  }
+
+  /// The cookies set by the server (from the 'set-cookie' header).
+  set cookies(List<String> value) {
+    _data['cookies'] = value;
+    _updated();
+  }
+
+  /// The elements of [connectionInfo] can either be [String]s or [int]s.
+  set connectionInfo(Map<String, dynamic /*String|int*/ > value) {
+    _data['connectionInfo'] = value;
+    _updated();
+  }
+
+  set headers(Map<String, List<String>> value) {
+    _data['headers'] = value;
+    _updated();
+  }
+
+  // The compression state of the response.
+  //
+  // This specifies whether the response bytes were compressed when they were
+  // received across the wire and whether callers will receive compressed or
+  // uncompressed bytes when they listen to the response body byte stream.
+  set compressionState(String value) {
+    _data['compressionState'] = value;
+    _updated();
+  }
+
+  set reasonPhrase(String value) {
+    _data['reasonPhrase'] = value;
+    _updated();
+  }
+
+  /// Whether the status code was one of the normal redirect codes.
+  set isRedirect(bool value) {
+    _data['isRedirect'] = value;
+    _updated();
+  }
+
+  /// The persistent connection state returned by the server.
+  set persistentConnection(bool value) {
+    _data['persistentConnection'] = value;
+    _updated();
+  }
+
+  /// The content length of the response body, in bytes.
+  set contentLength(int value) {
+    _data['contentLength'] = value;
+    _updated();
+  }
+
+  set statusCode(int value) {
+    _data['statusCode'] = value;
+    _updated();
+  }
+
+  /// The time at which the initial response was received, as a microsecond
+  /// value on the monotonic clock used by the [Timeline].
+  set startTime(int value) {
+    _data['startTime'] = value;
+    _updated();
+  }
+
+  /// The time at which the response was completed, as a microsecond value on
+  /// the monotonic clock used by the [Timeline]. Note that DevTools will not
+  /// consider the request to be complete until [endTime] is non-null.
+  set endTime(int value) {
+    _data['endTime'] = value;
+    _updated();
+  }
+
+  /// The error associated with the failed request.
+  set error(String value) {
+    _data['error'] = value;
+    _updated();
+  }
+
+  HttpProfileResponseData._(
+      Map<String, dynamic> this._data, void Function() this._updated) {
+    _data['redirects'] = <Map<String, dynamic>>[];
+  }
+}
+
 /// A record of debugging information about an HTTP request.
 final class HttpClientRequestProfile {
   /// Whether HTTP profiling is enabled or not.
@@ -14,20 +214,114 @@ final class HttpClientRequestProfile {
   static set profilingEnabled(bool enabled) =>
       HttpClient.enableTimelineLogging = enabled;
 
-  String? requestMethod;
-  String? requestUri;
+  final _data = <String, dynamic>{};
+
+  /// The ID of the isolate the request was issued from.
+  String? get isolateId => _data['isolateId'] as String?;
+  set isolateId(String? value) {
+    _data['isolateId'] = value;
+    _updated();
+  }
+
+  /// The HTTP request method associated with the request.
+  String? get requestMethod => _data['requestMethod'] as String?;
+  set requestMethod(String? value) {
+    _data['requestMethod'] = value;
+    _updated();
+  }
+
+  /// The URI to which the request was sent.
+  String? get requestUri => _data['requestUri'] as String?;
+  set requestUri(String? value) {
+    _data['requestUri'] = value;
+    _updated();
+  }
+
+  /// Records an event related to the request.
+  ///
+  /// Usage example:
+  ///
+  /// ```dart
+  /// profile.addEvent(HttpProfileRequestEvent(Timeline.now, "Connection Established");
+  /// profile.addEvent(HttpProfileRequestEvent(Timeline.now, "Remote Disconnected");
+  /// ```
+  void addEvent(HttpProfileRequestEvent event) {
+    _data['events'].add(event._toJson());
+    _updated();
+  }
+
+  /// The time at which the request was initiated, as a microsecond value on the
+  /// monotonic clock used by the [Timeline].
+  int? get requestStartTimestamp => _data['requestStartTimestamp'] as int?;
+  set requestStartTimestamp(int? value) {
+    _data['requestStartTimestamp'] = value;
+    _updated();
+  }
+
+  /// The time at which the request was completed, as a microsecond value on the
+  /// monotonic clock used by the [Timeline]. Note that DevTools will not
+  /// consider the request to be complete until [requestEndTimestamp] is
+  /// non-null.
+  int? get requestEndTimestamp => _data['requestEndTimestamp'] as int?;
+  set requestEndTimestamp(int? value) {
+    _data['requestEndTimestamp'] = value;
+    _updated();
+  }
 
-  HttpClientRequestProfile._();
+  /// Details about the request.
+  late final HttpProfileRequestData requestData;
+
+  final StreamController<List<int>> _requestBody =
+      StreamController<List<int>>();
+
+  /// The body of the request.
+  StreamSink<List<int>> get requestBodySink {
+    _updated();
+    return _requestBody.sink;
+  }
+
+  /// Details about the response.
+  late final HttpProfileResponseData responseData;
+
+  final StreamController<List<int>> _responseBody =
+      StreamController<List<int>>();
+
+  /// The body of the response.
+  StreamSink<List<int>> get responseBodySink {
+    _updated();
+    return _responseBody.sink;
+  }
+
+  void _updated() => _data['_lastUpdateTime'] = Timeline.now;
+
+  HttpClientRequestProfile._() {
+    _data['events'] = <Map<String, dynamic>>[];
+    _data['requestData'] = <String, dynamic>{};
+    requestData = HttpProfileRequestData._(
+        _data['requestData'] as Map<String, dynamic>, _updated);
+    _data['responseData'] = <String, dynamic>{};
+    responseData = HttpProfileResponseData._(
+        _data['responseData'] as Map<String, dynamic>, _updated);
+    _data['_requestBodyStream'] = _requestBody.stream;
+    _data['_responseBodyStream'] = _responseBody.stream;
+    // This entry is needed to support the updatedSince parameter of
+    // ext.dart.io.getHttpProfile.
+    _data['_lastUpdateTime'] = 0;
+  }
 
-  /// If HTTP profiling is enabled, returns
-  /// a [HttpClientRequestProfile] otherwise returns `null`.
+  /// If HTTP profiling is enabled, returns an [HttpClientRequestProfile],
+  /// otherwise returns `null`.
   static HttpClientRequestProfile? profile() {
-    // Always return `null` in product mode so that the
-    // profiling code can be tree shaken away.
+    // Always return `null` in product mode so that the profiling code can be
+    // tree shaken away.
     if (const bool.fromEnvironment('dart.vm.product') || !profilingEnabled) {
       return null;
     }
     final requestProfile = HttpClientRequestProfile._();
+    // This entry is needed to support the id parameter of
+    // ext.dart.io.getHttpProfileRequest.
+    requestProfile._data['id'] =
+        'from_package/${addHttpClientProfilingData(requestProfile._data)}';
     return requestProfile;
   }
 }