github.com/tetratelabs/proxy-wasm-go-sdk/examples/http_body
this example demonstrates how to perform operation on a request or response body like append/prepend/replace.
To modify the request:
$ curl -XPUT localhost:18000 --data '[initial body]' -H "buffer-operation: prepend"
[this is prepended body][initial body]
$ curl -XPUT localhost:18000 --data '[initial body]' -H "buffer-operation: append"
[initial body][this is appended body]
$ curl -XPUT localhost:18000 --data '[initial body]' -H "buffer-operation: replace"
[this is replaced body]
To modify the response:
$ curl -XPUT localhost:18000 --data '[initial body]' -H "buffer-operation: prepend" -H "buffer-replace-at: response"
[this is prepended body][initial body]
$ curl -XPUT localhost:18000 --data '[initial body]' -H "buffer-operation: append" -H "buffer-replace-at: response"
[initial body][this is appended body]
$ curl -XPUT localhost:18000 --data '[initial body]' -H "buffer-operation: replace" -H "buffer-replace-at: response"
[this is replaced body]
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