feat: add http/2 support

[kemingy]

hyper can serve the traffic with HTTP/1.1 & HTTP/2.

Verified with curl -I --http2-prior-knowledge -w '%{http_version}\n' http://127.0.0.1:8000/metrics.

[kemingy]

For Python httpx, you will need:

import httpx

# force to use HTTP/2
client = httpx.Client(http1=False, http2=True)
resp = client.post('http://127.0.0.1:8000/inference', json={'time': 0})

print(resp.http_version)

• refer to How to force enable HTTP/2.0 encode/httpx#3261 (comment)

[lkevinzc]

Now the server will only support http/2? Will it be better to let user configure?

[kemingy]

It supports both. Depends on which protocol the client uses.

…

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