Bug fix: Envoy ext_proc 500 error when both value and raw_value are set in HeaderValue (#255)

Signed-off-by: zt2370 <[email protected]>

Author: ztang2370

src/semantic-router/pkg/extproc/request_handler.go

@@ -508,7 +508,6 @@ func (r *OpenAIRouter) handleModelRouting(openAIRequest *openai.ChatCompletionNe
 					setHeaders = append(setHeaders, &core.HeaderValueOption{
 						Header: &core.HeaderValue{
 							Key:      "x-selected-model",
-							Value:    actualModel,
 							RawValue: []byte(actualModel),
 						},
 					})