fix proxy stuck on blocking malicious package (#153)

* fix proxy stuck on blocking malicious package

* update pmg e2e

.github/workflows/pmg-e2e.yml

@@ -164,7 +164,7 @@ jobs:
           echo "Testing pip manifest installation via proxy mode..."
           pmg pip freeze > requirements.txt
           pmg pip uninstall -y requests numpy
-          pmg pip install -r requirements.txt
+          pmg pip install -r <(grep -v '^PMG:' requirements.txt)
           python -c "import requests, numpy; print('pip manifest ok:', requests.__version__, numpy.__version__)"
           deactivate
 
@@ -183,7 +183,7 @@ jobs:
           echo "Testing pip3 manifest installation via proxy mode..."
           pmg pip3 freeze > requirements3.txt
           pmg pip3 uninstall -y requests numpy
-          pmg pip3 install -r requirements3.txt
+          pmg pip3 install -r <(grep -v '^PMG:' requirements3.txt)
           python -c "import requests, numpy; print('pip3 manifest ok:', requests.__version__, numpy.__version__)"
           deactivate
 
@@ -205,7 +205,7 @@ jobs:
 
           echo "Testing uv pip install from requirements via proxy mode..."
           pmg uv pip freeze > requirements.txt
-          pmg uv pip install -r requirements.txt
+          pmg uv pip install -r <(grep -v '^PMG:' requirements.txt)
           pmg uv pip show requests >/dev/null
           pmg uv pip show numpy >/dev/null
           cd ..

proxy/proxy.go

@@ -283,8 +283,25 @@ func (ps *proxyServer) registerHandlers() {
 				}
 
 				log.Debugf("[%s] Blocked by %s: %s", reqCtx.RequestID, interceptor.Name(), req.URL.String())
+				r := goproxy.NewResponse(req, goproxy.ContentTypeText, statusCode, message)
 
-				return req, goproxy.NewResponse(req, goproxy.ContentTypeText, statusCode, message)
+				// goproxy v1.8.x writes the response via (*http.Response).Write for MITM traffic.
+				// Ensure the protocol version is valid (defaults to HTTP/0.0 otherwise).
+				// Ref: https://github.com/elazarl/goproxy/issues/745
+				if req.ProtoMajor > 0 {
+					r.Proto = req.Proto
+					r.ProtoMajor = req.ProtoMajor
+					r.ProtoMinor = req.ProtoMinor
+				} else {
+					r.Proto = "HTTP/1.1"
+					r.ProtoMajor = 1
+					r.ProtoMinor = 1
+				}
+				r.Close = true
+				r.Header.Set("Connection", "close")
+				r.Header.Set("Proxy-Connection", "close")
+
+				return req, r
 
 			case ActionModifyRequest:
 				if resp.ModifiedHeaders != nil {