Authentication based on any custom HTTP header, e.g. private tokens, OAuth tokens, etc.

[[sub:preemptive_authentication]]
=== Using preemptive authentication

Gradle's default behavior is to only submit credentials when a server responds with an authentication challenge in the form of an HTTP 401 response.
In some cases, the server will respond with a different code (ex. for repositories hosted on GitHub a 404 is returned) causing dependency resolution to fail.

	// on the wire, but not using TCP.  Use a Transport with a
	// custom dialer that returns a fake net.Conn that waits
	// for the full input (and recording it), and then responds
	// with a dummy response.
	var buf bytes.Buffer // records the output
	pr, pw := io.Pipe()
	defer pr.Close()
	defer pw.Close()
	dr := &delegateReader{c: make(chan io.Reader)}

	t := &Transport{

	// Deprecated: ErrWriteAfterFlush is no longer returned by
	// anything in the net/http package. Callers should not
	// compare errors against this variable.
	ErrWriteAfterFlush = errors.New("unused")
)

// A Handler responds to an HTTP request.
//
// [Handler.ServeHTTP] should write reply headers and data to the [ResponseWriter]
// and then return. Returning signals that the request is finished; it

	http.StatusOK,
	http.StatusFound,
	http.StatusMovedPermanently,
	http.StatusTemporaryRedirect,
	http.StatusBadRequest,
	http.StatusNotFound,
	http.StatusSwitchingProtocols,
)

// ServeHTTP responds to HTTP requests on the Kubelet.
func (s *Server) ServeHTTP(w http.ResponseWriter, req *http.Request) {
	handler := httplog.WithLogging(s.restfulCont, statusesNoTracePred)

	// monitor http requests

     * Protocol negotiation is only attempted for HTTPS URLs.
     *
     * [Protocol.HTTP_1_0] is not supported in this set. Requests are initiated with `HTTP/1.1`. If
     * the server responds with `HTTP/1.0`, that will be exposed by [Response.protocol].
     *
     * [alpn]: http://tools.ietf.org/html/draft-ietf-tls-applayerprotoneg
     * [rfc_2616]: http://www.w3.org/Protocols/rfc2616/rfc2616.html

                                requestRedirect:
                                  description: "RequestRedirect defines a schema for
                                    a filter that responds to the request with an
                                    HTTP redirection. \n Support: Core"
                                  properties:
                                    hostname:

	DryRun []string `json:"dryRun,omitempty" protobuf:"bytes,5,rep,name=dryRun"`
}

const (
	// FieldValidationIgnore ignores unknown/duplicate fields
	FieldValidationIgnore = "Ignore"
	// FieldValidationWarn responds with a warning, but successfully serve the request
	FieldValidationWarn = "Warn"
	// FieldValidationStrict fails the request on unknown/duplicate fields
	FieldValidationStrict = "Strict"
)

	{
		expectation:      "100-continue",
		readBody:         true,
		chunked:          true,
		expectedResponse: "100 Continue",
	},
}

// Tests that the server responds to the "Expect" request header
// correctly.
func TestServerExpect(t *testing.T) { run(t, testServerExpect, []testMode{http1Mode}) }
func testServerExpect(t *testing.T, mode testMode) {

	// set it, only then do we transparently decode the gzip.
	addedGzip bool

	// Optional blocking chan for Expect: 100-continue (for send).
	// If the request has an "Expect: 100-continue" header and
	// the server responds 100 Continue, readLoop send a value
	// to writeLoop via this chan.
	continueCh chan<- struct{}

	callerGone <-chan struct{} // closed when roundTrip caller has returned
}

    executeSynchronously(request).assertBody("abc")
  }

  /**
   * Make a request with two routes. The first route will fail because the null server connects but
   * never responds. The manual retry will succeed.
   */
  @Test
  fun readTimeoutFails() {
    server.enqueue(MockResponse(socketPolicy = StallSocketAtStart))
    server2.enqueue(
      MockResponse(body = "success!"),