// ServeHTTP handles the proxy request
func (h *UpgradeAwareProxyHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
if len(h.Location.Scheme) == 0 {
h.Location.Scheme = "http"
}
if h.tryUpgrade(w, req) {
return
}
if h.UpgradeRequired {
h.Responder.Error(errors.NewBadRequest("Upgrade request required"))
return
}
loc := *h.Location
loc.RawQuery = req.URL.RawQuery
// If original request URL ended in '/', append a '/' at the end of the
// of the proxy URL
if !strings.HasSuffix(loc.Path, "/") && strings.HasSuffix(req.URL.Path, "/") {
loc.Path += "/"
}
// From pkg/apiserver/proxy.go#ServeHTTP:
// Redirect requests with an empty path to a location that ends with a '/'
// This is essentially a hack for http://issue.k8s.io/4958.
// Note: Keep this code after tryUpgrade to not break that flow.
if len(loc.Path) == 0 {
var queryPart string
if len(req.URL.RawQuery) > 0 {
queryPart = "?" + req.URL.RawQuery
}
w.Header().Set("Location", req.URL.Path+"/"+queryPart)
w.WriteHeader(http.StatusMovedPermanently)
return
}
if h.Transport == nil || h.WrapTransport {
h.Transport = h.defaultProxyTransport(req.URL, h.Transport)
}
newReq, err := http.NewRequest(req.Method, loc.String(), req.Body)
if err != nil {
h.Responder.Error(err)
return
}
newReq.Header = req.Header
newReq.ContentLength = req.ContentLength
// Copy the TransferEncoding is for future-proofing. Currently Go only supports "chunked" and
// it can determine the TransferEncoding based on ContentLength and the Body.
newReq.TransferEncoding = req.TransferEncoding
proxy := httputil.NewSingleHostReverseProxy(&url.URL{Scheme: h.Location.Scheme, Host: h.Location.Host})
proxy.Transport = h.Transport
proxy.FlushInterval = h.FlushInterval
proxy.ServeHTTP(w, newReq)
}
// ServeHTTP handles the proxy request
func (h *UpgradeAwareProxyHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
h.err = nil
if len(h.Location.Scheme) == 0 {
h.Location.Scheme = "http"
}
if h.tryUpgrade(w, req) {
return
}
if h.UpgradeRequired {
h.err = errors.NewBadRequest("Upgrade request required")
return
}
loc := *h.Location
loc.RawQuery = req.URL.RawQuery
// If original request URL ended in '/', append a '/' at the end of the
// of the proxy URL
if !strings.HasSuffix(loc.Path, "/") && strings.HasSuffix(req.URL.Path, "/") {
loc.Path += "/"
}
// From pkg/apiserver/proxy.go#ServeHTTP:
// Redirect requests with an empty path to a location that ends with a '/'
// This is essentially a hack for https://github.com/GoogleCloudPlatform/kubernetes/issues/4958.
// Note: Keep this code after tryUpgrade to not break that flow.
if len(loc.Path) == 0 {
var queryPart string
if len(req.URL.RawQuery) > 0 {
queryPart = "?" + req.URL.RawQuery
}
w.Header().Set("Location", req.URL.Path+"/"+queryPart)
w.WriteHeader(http.StatusMovedPermanently)
return
}
if h.Transport == nil {
h.Transport = h.defaultProxyTransport(req.URL)
}
newReq, err := http.NewRequest(req.Method, loc.String(), req.Body)
if err != nil {
h.err = err
return
}
newReq.Header = req.Header
proxy := httputil.NewSingleHostReverseProxy(&url.URL{Scheme: h.Location.Scheme, Host: h.Location.Host})
proxy.Transport = h.Transport
proxy.FlushInterval = h.FlushInterval
proxy.ServeHTTP(w, newReq)
}