WASM to read some value from body and update headers accordingly

[kushagar]

So I have a use case where I want to read a request body , take out a key and use it's value to update the headers before sending request to the upstream.But problem with proxy wasm is once request is passed to on_http_request_body function, I cannot update headers. Can someone help me with how I can work around this( I don't want to use lua).

[soulxu]

cc @kyessenov

[kyessenov]

Please follow this issue proxy-wasm/spec#63. It requires a bump in ABI version, but it's a priority to support this use case.

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