HTTP/2 Support

Enable 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 HTTP protocol with features:

• Multiplexing - Multiple requests over single connection
• Header compression - Less data transmitted
• Server Push - Server sends data in advance
• Prioritization - Important resources load first
• Single connection - No new connection per request

Performance Comparison

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 (parallel)

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 servers)
• Not supported in some proxies

When to Use

Yes

• Many parallel requests to same host
• High network load
• Performance is critical

No

• Simple single requests
• Server doesn't support HTTP/2
• Need compatibility with older systems