Golang Request.Proto方法代码示例

func (p *WebsocketProxy) Proxy(w http.ResponseWriter, r *http.Request) {
	hj, ok := w.(http.Hijacker)
	if !ok {
		log.Println("hijack assertion failed", r.Host, r.URL.Path)
		p.handler.ServeHTTP(w, r) // last-ditch effort as plain http
		return
	}
	conn, rw, err := hj.Hijack()
	if err != nil {
		log.Println("hijack failed", r.Host, r.URL.Path, err)
		p.handler.ServeHTTP(w, r) // last-ditch effort as plain http
		return
	}
	defer conn.Close()
	rw.Flush()

	wrapreq := new(http.Request)
	wrapreq.Proto = "HTTP/1.1"
	wrapreq.ProtoMajor, wrapreq.ProtoMinor = 1, 1
	wrapreq.Method = "WEBSOCKET"
	wrapreq.Host = r.Host
	const dummy = "/"
	wrapreq.URL = &url.URL{Path: dummy}
	var buf bytes.Buffer
	r.Write(&buf)
	wrapreq.Body = ioutil.NopCloser(io.MultiReader(&buf, conn))
	resp, err := p.transport.RoundTrip(wrapreq)
	if err != nil || resp.StatusCode != 200 {
		io.WriteString(conn, "HTTP/1.0 503 Gateway Failed\r\n")
		io.WriteString(conn, "Connection: close\r\n\r\n")
		return
	}
	defer resp.Body.Close()
	io.Copy(conn, resp.Body)
}

func (f *Forwarder) copyRequest(req *http.Request, u *url.URL) *http.Request {
	outReq := new(http.Request)
	*outReq = *req // includes shallow copies of maps, but we handle this below

	outReq.URL = utils.CopyURL(req.URL)
	outReq.URL.Scheme = u.Scheme
	outReq.URL.Host = u.Host
	// workaround for https://github.com/golang/go/issues/10433
	outReq.URL.Opaque = mergeStartingSlashes(req.RequestURI)
	// raw query is already included in RequestURI, so ignore it to avoid dupes
	outReq.URL.RawQuery = ""
	// Do not pass client Host header unless optsetter PassHostHeader is set.
	if f.passHost != true {
		outReq.Host = u.Host
	}
	outReq.Proto = "HTTP/1.1"
	outReq.ProtoMajor = 1
	outReq.ProtoMinor = 1

	// Overwrite close flag so we can keep persistent connection for the backend servers
	outReq.Close = false

	outReq.Header = make(http.Header)
	utils.CopyHeaders(outReq.Header, req.Header)

	if f.rewriter != nil {
		f.rewriter.Rewrite(outReq)
	}
	return outReq
}

// This function alters the original request - adds/removes headers, removes hop headers,
// changes the request path.
func rewriteRequest(req *http.Request, cmd *command.Forward, upstream *command.Upstream) *http.Request {
	outReq := new(http.Request)
	*outReq = *req // includes shallow copies of maps, but we handle this below

	outReq.URL.Scheme = upstream.Scheme
	outReq.URL.Host = fmt.Sprintf("%s:%d", upstream.Host, upstream.Port)
	if len(cmd.RewritePath) != 0 {
		outReq.URL.Path = cmd.RewritePath
	}

	outReq.URL.RawQuery = req.URL.RawQuery

	outReq.Proto = "HTTP/1.1"
	outReq.ProtoMajor = 1
	outReq.ProtoMinor = 1
	outReq.Close = false

	glog.Infof("Proxying request to: %v", outReq)

	outReq.Header = make(http.Header)
	netutils.CopyHeaders(outReq.Header, req.Header)

	if clientIP, _, err := net.SplitHostPort(req.RemoteAddr); err == nil {
		// TODO(pquerna): configure this?  Not all backends properly parse the header..
		if TRUST_FORWARD_HEADER {
			if prior, ok := outReq.Header["X-Forwarded-For"]; ok {
				clientIP = strings.Join(prior, ", ") + ", " + clientIP
			}
		}
		outReq.Header.Set("X-Forwarded-For", clientIP)
	}

	if req.TLS != nil {
		outReq.Header.Set("X-Forwarded-Proto", "https")
	} else {
		outReq.Header.Set("X-Forwarded-Proto", "http")
	}

	if req.Host != "" {
		outReq.Header.Set("X-Forwarded-Host", req.Host)
	}

	outReq.Header.Set("X-Forwarded-Server", vulcanHostname)

	if len(cmd.RemoveHeaders) != 0 {
		netutils.RemoveHeaders(cmd.RemoveHeaders, outReq.Header)
	}

	// Add generic instructions headers to the request
	if len(cmd.AddHeaders) != 0 {
		glog.Info("Proxying instructions headers:", cmd.AddHeaders)
		netutils.CopyHeaders(outReq.Header, cmd.AddHeaders)
	}

	// Remove hop-by-hop headers to the backend.  Especially
	// important is "Connection" because we want a persistent
	// connection, regardless of what the client sent to us.
	netutils.RemoveHeaders(hopHeaders, outReq.Header)
	return outReq
}

// copyRequest creates a new proxy request with some modifications from an original request.
func copyRequest(originalRequest *http.Request) *http.Request {
	pr := new(http.Request)
	*pr = *originalRequest
	pr.Proto = "HTTP/1.1"
	pr.ProtoMajor = 1
	pr.ProtoMinor = 1
	pr.Close = false
	pr.Header = make(http.Header)
	pr.URL.Scheme = "http"
	pr.URL.Path = originalRequest.URL.Path

	// Copy all header fields.
	for key, values := range originalRequest.Header {
		for _, value := range values {
			pr.Header.Add(key, value)
		}
	}

	// Remove ignored header fields.
	for _, header := range ignoredHeaderNames {
		pr.Header.Del(header)
	}

	// Append this machine's host name into X-Forwarded-For.
	if requestHost, _, err := net.SplitHostPort(originalRequest.RemoteAddr); err == nil {
		if originalValues, ok := pr.Header["X-Forwarded-For"]; ok {
			requestHost = strings.Join(originalValues, ", ") + ", " + requestHost
		}
		pr.Header.Set("X-Forwarded-For", requestHost)
	}

	return pr
}

func (proxy *Proxy) copyRequest(r *http.Request) *http.Request {
	proxyRequest := new(http.Request)
	*proxyRequest = *r
	proxyRequest.Proto = "HTTP/1.1"
	proxyRequest.ProtoMajor = 1
	proxyRequest.ProtoMinor = 1
	proxyRequest.Close = false
	proxyRequest.Header = make(http.Header)
	proxyRequest.URL.Scheme = "http"
	proxyRequest.URL.Path = r.URL.Path

	for key, values := range r.Header {
		for _, value := range values {
			proxyRequest.Header.Add(key, value)
		}
	}
	for _, headerName := range ignoredHeaderNames {
		proxyRequest.Header.Del(headerName)
	}
	if requestHost, _, err := net.SplitHostPort(r.RemoteAddr); err == nil {
		if values, ok := proxyRequest.Header["X-Forwarded-For"]; ok {
			requestHost = strings.Join(values, ", ") + ", " + requestHost
		}
		proxyRequest.Header.Set("X-Forwarded-For", requestHost)
	}

	return proxyRequest
}

func (f *Forwarder) copyRequest(req *http.Request, u *url.URL) *http.Request {
	outReq := new(http.Request)
	*outReq = *req // includes shallow copies of maps, but we handle this below

	outReq.URL = utils.CopyURL(req.URL)
	outReq.URL.Scheme = u.Scheme
	outReq.URL.Host = u.Host
	outReq.URL.Opaque = req.RequestURI
	// raw query is already included in RequestURI, so ignore it to avoid dupes
	outReq.URL.RawQuery = ""
	// Go doesn't implicitly pass the host header unless you set Host on the request
	outReq.Host = u.Host

	outReq.Proto = "HTTP/1.1"
	outReq.ProtoMajor = 1
	outReq.ProtoMinor = 1

	// Overwrite close flag so we can keep persistent connection for the backend servers
	outReq.Close = false

	outReq.Header = make(http.Header)
	utils.CopyHeaders(outReq.Header, req.Header)

	if f.rewriter != nil {
		f.rewriter.Rewrite(outReq)
	}
	return outReq
}

// RoundTrip implements http.RoundTripper.RoundTrip.
func (binder Binder) RoundTrip(req *http.Request) (*http.Response, error) {
	if req.Proto == "" {
		req.Proto = fmt.Sprintf("HTTP/%d.%d", req.ProtoMajor, req.ProtoMinor)
	}

	if req.Body != nil {
		if req.ContentLength == -1 {
			req.TransferEncoding = []string{"chunked"}
		}
	} else {
		req.Body = ioutil.NopCloser(bytes.NewReader(nil))
	}

	recorder := httptest.NewRecorder()

	binder.handler.ServeHTTP(recorder, req)

	resp := http.Response{
		Request:    req,
		StatusCode: recorder.Code,
		Status:     http.StatusText(recorder.Code),
		Header:     recorder.HeaderMap,
	}

	if recorder.Flushed {
		resp.TransferEncoding = []string{"chunked"}
	}

	if recorder.Body != nil {
		resp.Body = ioutil.NopCloser(recorder.Body)
	}

	return &resp, nil
}

func (l *HttpLocation) copyRequest(req *http.Request, body netutils.MultiReader, endpoint endpoint.Endpoint) *http.Request {
	outReq := new(http.Request)
	*outReq = *req // includes shallow copies of maps, but we handle this below

	// Set the body to the enhanced body that can be re-read multiple times and buffered to disk
	outReq.Body = body

	endpointURL := endpoint.GetUrl()
	outReq.URL.Scheme = endpointURL.Scheme
	outReq.URL.Host = endpointURL.Host
	outReq.URL.Opaque = req.RequestURI
	// raw query is already included in RequestURI, so ignore it to avoid dupes
	outReq.URL.RawQuery = ""

	outReq.Proto = "HTTP/1.1"
	outReq.ProtoMajor = 1
	outReq.ProtoMinor = 1

	// Overwrite close flag so we can keep persistent connection for the backend servers
	outReq.Close = false

	outReq.Header = make(http.Header)
	netutils.CopyHeaders(outReq.Header, req.Header)
	return outReq
}

// NewFastHTTPHandler wraps net/http handler to fasthttp request handler,
// so it can be passed to fasthttp server.
//
// While this function may be used for easy switching from net/http to fasthttp,
// it has the following drawbacks comparing to using manually written fasthttp
// request handler:
//
//     * A lot of useful functionality provided by fasthttp is missing
//       from net/http handler.
//     * net/http -> fasthttp handler conversion has some overhead,
//       so the returned handler will be always slower than manually written
//       fasthttp handler.
//
// So it is advisable using this function only for quick net/http -> fasthttp
// switching. Then manually convert net/http handlers to fasthttp handlers
// according to https://github.com/valyala/fasthttp#switching-from-nethttp-to-fasthttp .
func NewFastHTTPHandler(h http.Handler) fasthttp.RequestHandler {
	return func(ctx *fasthttp.RequestCtx) {
		var r http.Request

		body := ctx.PostBody()
		r.Method = string(ctx.Method())
		r.Proto = "HTTP/1.1"
		r.ProtoMajor = 1
		r.ProtoMinor = 1
		r.RequestURI = string(ctx.RequestURI())
		r.ContentLength = int64(len(body))
		r.Host = string(ctx.Host())
		r.RemoteAddr = ctx.RemoteAddr().String()

		hdr := make(http.Header)
		ctx.Request.Header.VisitAll(func(k, v []byte) {
			hdr.Set(string(k), string(v))
		})
		r.Header = hdr
		r.Body = &netHTTPBody{body}

		var w netHTTPResponseWriter
		h.ServeHTTP(&w, &r)

		ctx.SetStatusCode(w.StatusCode())
		for k, vv := range w.Header() {
			for _, v := range vv {
				ctx.Response.Header.Set(k, v)
			}
		}
		ctx.Write(w.body)
	}
}

func (p *ReverseProxy) ServeHTTP(req *http.Request) (*http.Response, error) {

	transport := p.Transport
	if transport == nil {
		transport = http.DefaultTransport
	}

	outreq := new(http.Request)
	*outreq = *req // includes shallow copies of maps, but okay

	p.Director(outreq)
	outreq.Proto = "HTTP/1.1"
	outreq.ProtoMajor = 1
	outreq.ProtoMinor = 1
	outreq.Close = false

	// Remove hop-by-hop headers to the backend.  Especially
	// important is "Connection" because we want a persistent
	// connection, regardless of what the client sent to us.  This
	// is modifying the same underlying map from req (shallow
	// copied above) so we only copy it if necessary.
	copiedHeaders := false
	for _, h := range hopHeaders {
		if outreq.Header.Get(h) != "" {
			if !copiedHeaders {
				outreq.Header = make(http.Header)
				copyHeader(outreq.Header, req.Header)
				copiedHeaders = true
			}
			outreq.Header.Del(h)
		}
	}

	if clientIP, _, err := net.SplitHostPort(req.RemoteAddr); err == nil {
		// If we aren't the first proxy retain prior
		// X-Forwarded-For information as a comma+space
		// separated list and fold multiple headers into one.
		if prior, ok := outreq.Header["X-Forwarded-For"]; ok {
			clientIP = strings.Join(prior, ", ") + ", " + clientIP
		}
		outreq.Header.Set("X-Forwarded-For", clientIP)
	}

	res, err := transport.RoundTrip(outreq)
	if err != nil {
		return res, err
	}

	for _, p := range *p.Plugins {
		p.Outbound(res)
	}

	for _, h := range hopHeaders {
		res.Header.Del(h)
	}

	return res, nil

}

func makeRequest(params map[string]string) (*http.Request, error) {
	r := new(http.Request)
	r.Method = params["METHOD"]
	if r.Method == "" {
		return nil, errors.New("mongrel2: no METHOD")
	}

	r.Proto = params["VERSION"]
	var ok bool
	r.ProtoMajor, r.ProtoMinor, ok = http.ParseHTTPVersion(r.Proto)
	if !ok {
		return nil, errors.New("mongrel2: invalid protocol version")
	}

	r.Trailer = http.Header{}
	r.Header = http.Header{}

	r.Host = params["Host"]
	r.Header.Set("Referer", params["Referer"])
	r.Header.Set("User-Agent", params["User-Agent"])

	if lenstr := params["Content-Length"]; lenstr != "" {
		clen, err := strconv.ParseInt(lenstr, 10, 64)
		if err != nil {
			return nil, errors.New("mongrel2: bad Content-Length")
		}
		r.ContentLength = clen
	}

	for k, v := range params {
		if !skipHeader[k] {
			r.Header.Add(k, v)
		}
	}

	// TODO: cookies

	if r.Host != "" {
		url_, err := url.Parse("http://" + r.Host + params["URI"])
		if err != nil {
			return nil, errors.New("mongrel2: failed to parse host and URI into a URL")
		}
		r.URL = url_
	}
	if r.URL == nil {
		url_, err := url.Parse(params["URI"])
		if err != nil {
			return nil, errors.New("mongrel2: failed to parse URI into a URL")
		}
		r.URL = url_
	}

	// TODO: how do we know if we're using HTTPS?
	// TODO: fill in r.RemoteAddr

	return r, nil
}

func (p *ReverseProxy) ServeHTTP(rw http.ResponseWriter, outreq *http.Request, respUpdateFn respUpdateFn) error {
	transport := p.Transport
	if transport == nil {
		transport = http.DefaultTransport
	}

	p.Director(outreq)
	outreq.Proto = "HTTP/1.1"
	outreq.ProtoMajor = 1
	outreq.ProtoMinor = 1
	outreq.Close = false

	res, err := transport.RoundTrip(outreq)
	if err != nil {
		return err
	} else if respUpdateFn != nil {
		respUpdateFn(res)
	}

	if res.StatusCode == http.StatusSwitchingProtocols && strings.ToLower(res.Header.Get("Upgrade")) == "websocket" {
		res.Body.Close()
		hj, ok := rw.(http.Hijacker)
		if !ok {
			return nil
		}

		conn, _, err := hj.Hijack()
		if err != nil {
			return err
		}
		defer conn.Close()

		backendConn, err := net.Dial("tcp", outreq.URL.Host)
		if err != nil {
			return err
		}
		defer backendConn.Close()

		outreq.Write(backendConn)

		go func() {
			io.Copy(backendConn, conn) // write tcp stream to backend.
		}()
		io.Copy(conn, backendConn) // read tcp stream from backend.
	} else {
		defer res.Body.Close()
		for _, h := range hopHeaders {
			res.Header.Del(h)
		}
		copyHeader(rw.Header(), res.Header)
		rw.WriteHeader(res.StatusCode)
		p.copyResponse(rw, res.Body)
	}

	return nil
}

func prepareRequest(req *http.Request) *http.Request {
	outreq := new(http.Request)
	*outreq = *req // includes shallow copies of maps, but okay

	// Pass the Request-URI verbatim without any modifications.
	//
	// NOTE: An exception must be made if the Request-URI is a path
	// beginning with "//" (e.g. "//foo/bar") because then
	// req.URL.RequestURI() would interpret req.URL.Opaque as being a URI
	// with the scheme stripped and so generate a URI like scheme:opaque
	// (e.g. "http://foo/bar") which would be incorrect, see:
	// https://github.com/golang/go/blob/f75aafd/src/net/url/url.go#L913-L931
	//
	// It is ok to make this exception because the fallback to
	// req.URL.EscapedPath will generate the correct Request-URI.
	if !strings.HasPrefix(req.RequestURI, "//") {
		outreq.URL.Opaque = strings.Split(strings.TrimPrefix(req.RequestURI, req.URL.Scheme+":"), "?")[0]
	}

	outreq.URL.Scheme = "http"
	outreq.Proto = "HTTP/1.1"
	outreq.ProtoMajor = 1
	outreq.ProtoMinor = 1
	outreq.Close = false

	// Remove hop-by-hop headers to the backend.
	outreq.Header = make(http.Header)
	copyHeader(outreq.Header, req.Header)
	for _, h := range hopHeaders {
		outreq.Header.Del(h)
	}

	// remove the Upgrade header and headers referenced in the Connection
	// header if HTTP < 1.1 or if Connection header didn't contain "upgrade":
	// https://tools.ietf.org/html/rfc7230#section-6.7
	if !req.ProtoAtLeast(1, 1) || !isConnectionUpgrade(req.Header) {
		outreq.Header.Del("Upgrade")

		// Especially important is "Connection" because we want a persistent
		// connection, regardless of what the client sent to us.
		outreq.Header.Del("Connection")

		// A proxy or gateway MUST parse a received Connection header field before a
		// message is forwarded and, for each connection-option in this field, remove
		// any header field(s) from the message with the same name as the
		// connection-option, and then remove the Connection header field itself (or
		// replace it with the intermediary's own connection options for the
		// forwarded message): https://tools.ietf.org/html/rfc7230#section-6.1
		tokens := strings.Split(req.Header.Get("Connection"), ",")
		for _, hdr := range tokens {
			outreq.Header.Del(hdr)
		}
	}

	return outreq
}

func reverseProxy(w http.ResponseWriter, req *http.Request) {
	logRequest(req)

	if rSensitivePath.MatchString(req.URL.Path) {
		w.WriteHeader(http.StatusForbidden)
		return
	}

	outReq := new(http.Request)
	outReq.Method = req.Method
	outReq.URL = &url.URL{
		Scheme:   "http",
		Host:     host,
		Path:     req.URL.Path,
		RawQuery: req.URL.RawQuery,
	}
	outReq.Proto = "HTTP/1.1"
	outReq.ProtoMajor = 1
	outReq.ProtoMinor = 1
	outReq.Header = make(http.Header)
	outReq.Body = req.Body
	outReq.ContentLength = req.ContentLength
	outReq.Host = host

	for _, h := range removeHeaders {
		req.Header.Del(h)
	}
	copyHeader(outReq.Header, req.Header)
	outReq.Header.Set("Host", host)
	outReq.Header.Set("Referer", baseURL)
	outReq.Header.Set("Origin", baseURL)

	resp, err := send(outReq)
	if err != nil {
		log.Printf("proxy error: %v", err)
		w.WriteHeader(http.StatusInternalServerError)
		return
	}
	defer resp.Body.Close()

	for _, h := range removeHeaders {
		resp.Header.Del(h)
	}
	if loc := resp.Header.Get("Location"); loc != "" {
		if u, err := url.Parse(loc); err == nil && u.Host == host {
			u.Scheme = "http"
			u.Host = req.Host
			resp.Header.Set("Location", u.String())
		}
	}
	copyHeader(w.Header(), resp.Header)
	w.WriteHeader(resp.StatusCode)

	io.Copy(w, resp.Body)
}

func (p *ReverseProxy) ServeHTTP(rw http.ResponseWriter, req *http.Request, location string) {
	transport := p.Transport
	if transport == nil {
		transport = http.DefaultTransport
	}

	outreq := new(http.Request)

	p.Director(outreq)
	outreq.Proto = "HTTP/1.1"
	outreq.ProtoMajor = 1
	outreq.ProtoMinor = 1
	outreq.Close = false

	// Remove hop-by-hop headers to the backend.  Especially
	// important is "Connection" because we want a persistent
	// connection, regardless of what the client sent to us.  This
	// is modifying the same underlying map from req (shallow
	// copied above) so we only copy it if necessary.
	copiedHeaders := false
	for _, h := range hopHeaders {
		if outreq.Header.Get(h) != "" {
			if !copiedHeaders {
				outreq.Header = make(http.Header)
				copyHeader(outreq.Header, req.Header)
				copiedHeaders = true
			}
			outreq.Header.Del(h)
		}
	}

	if clientIP, _, err := net.SplitHostPort(req.RemoteAddr); err == nil {
		// If we aren't the first proxy retain prior
		// X-Forwarded-For information as a comma+space
		// separated list and fold multiple headers into one.
		if prior, ok := outreq.Header["X-Forwarded-For"]; ok {
			clientIP = strings.Join(prior, ", ") + ", " + clientIP
		}
		outreq.Header.Set("X-Forwarded-For", clientIP)
	}

	res, err := transport.RoundTrip(outreq)
	if err != nil {
		log.Printf("http: proxy error: %v", err)
		rw.WriteHeader(http.StatusInternalServerError)
		return
	}
	defer res.Body.Close()

	copyHeader(rw.Header(), res.Header)

	rw.WriteHeader(res.StatusCode)
	p.copyResponse(rw, res.Body)
}