HTTP/2 Support¶

FastHTTP supports HTTP/2 for improved performance.

Installation¶

For HTTP/2 support, install additional dependencies:

pip install fasthttp-client[http2]

This installs httpx[http2] as a dependency.

Enabling HTTP/2¶

from fasthttp import FastHTTP

app = FastHTTP(http2=True)

What is HTTP/2?¶

HTTP/2 is the second version of the HTTP protocol that provides:

Multiplexing — multiple requests over a single connection
Header compression — less data is transmitted
Server Push — server can send data in advance
Prioritization — more important resources load first
Single connection — no need to create a new connection for each request

HTTP/2 Benefits¶

Before HTTP/2¶

Connection 1: GET /page
Connection 2: GET /style.css
Connection 3: GET /script.js
Connection 4: GET /image.png

With HTTP/2¶

Connection 1: GET /page, /style.css, /script.js, /image.png (in parallel)

Usage Example¶

from fasthttp import FastHTTP

app = FastHTTP(http2=True)


@app.get(url="https://httpbin.org/get")
async def get_data(resp):
    return resp.json()


@app.post(url="https://httpbin.org/post", json={"test": "data"})
async def post_data(resp):
    return resp.json()


if __name__ == "__main__":
    app.run()

Limitations¶

Not all servers support HTTP/2
Requires HTTPS (most browsers)
Not supported in some proxies

Checking HTTP/2¶

from fasthttp import FastHTTP

app = FastHTTP(http2=True)


@app.get(url="https://httpbin.org/get")
async def check_http2(resp):
    # Check if HTTP/2 is being used
    # (depends on server)
    return {
        "status": resp.status,
        "http_version": resp.headers.get("server"),
    }