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🗣 Wd提问: proxy h2c

🤖 Ai回答: The term proxy h2c typically refers to a HTTP/2 over cleartext (h2c) proxy, which is used in networking and web infrastructure to handle HTTP/2 traffic without encryption (i.e., not TLS-encrypted)、Let's break this down:

🔹 What is `h2c`?

h2c stands for HTTP/2 over Cleartext.
It is the non-TLS version of HTTP/2, meaning it uses plain text (not encrypted) over TCP.
Unlike HTTPS (which uses `h2` or `h2s` — HTTP/2 over TLS), `h2c` does not use SSL/TLS encryption.

⚠️ Note: `h2c` is rarely used in production because it lacks encryption and is vulnerable to eavesdropping and man-in-the-middle attacks.

🔹 What is a Proxy h2c?

A proxy h2c is a proxy server that:
Accepts incoming HTTP/2 requests over cleartext (`h2c`) on a specific port.
Forwards them to a backend server (e.g., an application server) using HTTP/2.
Often used in internal networks or development environments where encryption is not required or handled elsewhere.

🔹 Use Cases

1、Internal Microservices Communication
Services behind a reverse proxy may use `h2c` for faster performance without TLS overhead.
Example: A Kubernetes service forwarding `h2c` to a pod running an HTTP/2 server.

2、Development & Testing
Useful when testing HTTP/2 features without setting up TLS certificates.

3、Reverse Proxy with TLS Termination
External TLS (HTTPS) → Proxy terminates TLS → Internal `h2c` to backend.

🔹 Example: Using `nghttpx` as an h2c Proxy

bash
nghttpx can act as an h2c proxy
nghttpx \
frontend=0.0.0.0:80 \
backend=127.0.0.1:8080 \
h2c

This sets up a proxy listening on port 80 that forwards `h2c` traffic to a backend on port 8080.

🔹 Tools That Support h2c

nghttpx – A high-performance HTTP/2 proxy supporting `h2c`.
envoy – Can be configured to handle `h2c` upstreams.
nginx – With `http2` support, but usually requires TLS (`h2`)、For `h2c`, you need special configuration or alternative tools.

🔹 Important Notes

`h2c` is not secure and should not be exposed publicly.
Many modern systems default to `h2` (TLS-encrypted).
The IETF specification for `h2c` is defined in [RFC 7540](https://tools.ietf.org/html/rfc7540) (HTTP/2) and [RFC 8441](https://tools.ietf.org/html/rfc8441) (HTTP/2 over cleartext).

🔹 How to Test h2c

Use `curl` with `http2` and no TLS:

bash
curl http2 http://localhost:8080

Or with `nghttp`:

bash
nghttp -v http://localhost:8080

✅ Summary

| Feature | Description |

| h2c | HTTP/2 over cleartext (no TLS) |
| Proxy h2c | A proxy that forwards HTTP/2 cleartext traffic |
| Security | Not encrypted — use only internally |
| Common Use | Internal services, testing, reverse proxy after TLS termination |

If you're trying to set up or debug a `proxy h2c`, feel free to share your setup (e.g., tool, config, use case), and I can help further!

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提问时间: 2025-09-17 23:40:18

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