Question: proxywasm.GetHttpRequestHeaders() is returning error code = 6

[swapnilaniljanorkarjanorkar-sap]

Describe the bug / error

GetHttpRequestHeaders method is retuning is error = 6, I checked the source code but did not find any documentation and code related to error code 6.

What is your Envoy/Istio version?

1.19.6

What is the SDK version?

v0.22.0

What is your TinyGo version?

golang:1.19.10-buster

URL or snippet of your code including Envoy configuration

Additional context (Optional)

2024-04-10 00:58:38
2024-04-09T16:58:38.711061Z critical envoy wasm external/envoy/source/extensions/common/wasm/context.cc:1157
wasm log istio-system.istio-tenant-id-wasm-filter: Failed to get request headers: unknown status code: 6 thread=48

[MengjiaLiang]

Where did you call GetHttpRequestHeaders?
I used to hit issues when was calling it in the wrong stage that is out of these two stages.

// GetHttpRequestHeader is used for retrieving an HTTP request header value
// for given "key". Only available during types.HttpContext.OnHttpRequestHeaders and
// types.HttpContext.OnHttpStreamDone.

[mathetake]

#451