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Proxy-Wasm plugin example: HTTP headers

Proxy-Wasm plugin that logs HTTP request/response headers.

Building

$ cargo build --target wasm32-wasip1 --release

Using in Envoy

This example can be run with docker compose and has a matching Envoy configuration.

$ docker compose up

Send HTTP request to localhost:10000/hello:

$ curl localhost:10000/hello
Hello, World!

Expected Envoy logs:

[...] wasm log http_headers: #2 -> :authority: localhost:10000
[...] wasm log http_headers: #2 -> :path: /hello
[...] wasm log http_headers: #2 -> :method: GET
[...] wasm log http_headers: #2 -> :scheme: http
[...] wasm log http_headers: #2 -> user-agent: curl/7.81.0
[...] wasm log http_headers: #2 -> accept: */*
[...] wasm log http_headers: #2 -> x-forwarded-proto: http
[...] wasm log http_headers: #2 -> x-request-id: 3ed6eb3b-ddce-4fdc-8862-ddb8f168d406
[...] wasm log http_headers: #2 <- :status: 200
[...] wasm log http_headers: #2 <- hello: World
[...] wasm log http_headers: #2 <- powered-by: proxy-wasm
[...] wasm log http_headers: #2 <- content-length: 14
[...] wasm log http_headers: #2 <- content-type: text/plain
[...] wasm log http_headers: #2 completed.