TUN-3617: Separate service from client, and implement different client for http vs. tcp origins

- extracted ResponseWriter from proxyConnection
 - added bastion tests over websocket
 - removed HTTPResp()
 - added some docstrings
 - Renamed some ingress clients as proxies
 - renamed instances of client to proxy in connection and origin
 - Stream no longer takes a context and logger.Service

h2mux/header.go

@@ -125,12 +125,12 @@ func IsWebsocketClientHeader(headerName string) bool {
 		headerName == "upgrade"
 }
 
-func H1ResponseToH2ResponseHeaders(h1 *http.Response) (h2 []Header) {
+func H1ResponseToH2ResponseHeaders(status int, h1 http.Header) (h2 []Header) {
 	h2 = []Header{
-		{Name: ":status", Value: strconv.Itoa(h1.StatusCode)},
+		{Name: ":status", Value: strconv.Itoa(status)},
 	}
-	userHeaders := make(http.Header, len(h1.Header))
-	for header, values := range h1.Header {
+	userHeaders := make(http.Header, len(h1))
+	for header, values := range h1 {
 		h2name := strings.ToLower(header)
 		if h2name == "content-length" {
 			// This header has meaning in HTTP/2 and will be used by the edge,

h2mux/header_test.go

@@ -579,7 +579,7 @@ func TestH1ResponseToH2ResponseHeaders(t *testing.T) {
 		Header:     mockHeaders,
 	}
 
-	headers := H1ResponseToH2ResponseHeaders(&mockResponse)
+	headers := H1ResponseToH2ResponseHeaders(mockResponse.StatusCode, mockResponse.Header)
 
 	serializedHeadersIndex := -1
 	for i, header := range headers {
@@ -622,7 +622,7 @@ func TestHeaderSize(t *testing.T) {
 		Header:     largeHeaders,
 	}
 
-	serializedHeaders := H1ResponseToH2ResponseHeaders(&mockResponse)
+	serializedHeaders := H1ResponseToH2ResponseHeaders(mockResponse.StatusCode, mockResponse.Header)
 	request, err := http.NewRequest(http.MethodGet, "https://example.com/", nil)
 	assert.NoError(t, err)
 	for _, header := range serializedHeaders {
@@ -669,6 +669,6 @@ func BenchmarkH1ResponseToH2ResponseHeaders(b *testing.B) {
 	b.ReportAllocs()
 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
-		_ = H1ResponseToH2ResponseHeaders(h1resp)
+		_ = H1ResponseToH2ResponseHeaders(h1resp.StatusCode, h1resp.Header)
 	}
 }