add raw handler support

proxychain/proxychain.go

@@ -530,7 +530,10 @@ func (chain *ProxyChain) Execute() error {
 	}
 
 	// in case api user did not set or forward content-type, we do it for them
-	if chain.Context.Get("content-type") == "" {
+	// warning: the fiber method chain.Context.Get() doesn't seem to work as described
+	ct := chain.Context.Response().Header.Peek("content-type")
+	CT := chain.Context.Response().Header.Peek("Content-Type")
+	if ct == nil && CT == nil {
 		chain.Context.Set("content-type", chain.Response.Header.Get("content-type"))
 	}
 

proxychain/responsemodifiers/modify_response_header.go

@@ -6,16 +6,16 @@ import (
 
 // SetResponseHeader modifies response headers from the upstream server
 func SetResponseHeader(key string, value string) proxychain.ResponseModification {
-	return func(px *proxychain.ProxyChain) error {
-		px.Context.Response().Header.Set(key, value)
+	return func(chain *proxychain.ProxyChain) error {
+		chain.Context.Set(key, value)
 		return nil
 	}
 }
 
 // DeleteResponseHeader removes response headers from the upstream server
 func DeleteResponseHeader(key string) proxychain.ResponseModification {
-	return func(px *proxychain.ProxyChain) error {
-		px.Context.Response().Header.Del(key)
+	return func(chain *proxychain.ProxyChain) error {
+		chain.Context.Response().Header.Del(key)
 		return nil
 	}
 }