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📁 ..
📄 alpn_test.go(3.01 KB)
📁 cgi
📄 client.go(33.4 KB)
📄 client_test.go(63.24 KB)
📄 clientserver_test.go(46.07 KB)
📄 clone.go(1.56 KB)
📄 cookie.go(11.53 KB)
📄 cookie_test.go(19.26 KB)
📁 cookiejar
📄 doc.go(3.42 KB)
📄 example_filesystem_test.go(2.04 KB)
📄 example_handle_test.go(560 B)
📄 example_test.go(5.38 KB)
📄 export_test.go(8.43 KB)
📁 fcgi
📄 filetransport.go(3.52 KB)
📄 filetransport_test.go(2.62 KB)
📄 fs.go(30.36 KB)
📄 fs_test.go(46.7 KB)
📄 h2_bundle.go(357.28 KB)
📄 h2_error.go(812 B)
📄 h2_error_test.go(1.04 KB)
📄 header.go(7.9 KB)
📄 header_test.go(6.05 KB)
📄 http.go(5.13 KB)
📄 http_test.go(5.22 KB)
📁 httptest
📁 httptrace
📁 httputil
📁 internal
📄 jar.go(900 B)
📄 main_test.go(4.94 KB)
📄 mapping.go(1.68 KB)
📄 mapping_test.go(2.95 KB)
📄 method.go(517 B)
📄 omithttp2.go(1.91 KB)
📄 pattern.go(15.17 KB)
📄 pattern_test.go(14.5 KB)
📁 pprof
📄 proxy_test.go(1.16 KB)
📄 range_test.go(2.38 KB)
📄 readrequest_test.go(9.7 KB)
📄 request.go(48.34 KB)
📄 request_test.go(42.39 KB)
📄 requestwrite_test.go(23.3 KB)
📄 response.go(11.1 KB)
📄 response_test.go(23.63 KB)
📄 responsecontroller.go(4.17 KB)
📄 responsecontroller_test.go(9.81 KB)
📄 responsewrite_test.go(6.89 KB)
📄 roundtrip.go(566 B)
📄 roundtrip_js.go(11.8 KB)
📄 routing_index.go(3.95 KB)
📄 routing_index_test.go(4.02 KB)
📄 routing_tree.go(7.48 KB)
📄 routing_tree_test.go(6.89 KB)
📄 serve_test.go(192.54 KB)
📄 servemux121.go(5.6 KB)
📄 server.go(120.67 KB)
📄 server_test.go(6.95 KB)
📄 sniff.go(7.9 KB)
📄 sniff_test.go(9.56 KB)
📄 socks_bundle.go(12.9 KB)
📄 status.go(7.45 KB)
📁 testdata
📄 transfer.go(30.89 KB)
📄 transfer_test.go(9.13 KB)
📄 transport.go(87.81 KB)
📄 transport_default_other.go(362 B)
📄 transport_default_wasm.go(364 B)
📄 transport_internal_test.go(6.05 KB)
📄 transport_test.go(186.06 KB)
📄 triv.go(3.22 KB)

Editing: responsecontroller.go

// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package http

import (
	"bufio"
	"fmt"
	"net"
	"time"
)

// A ResponseController is used by an HTTP handler to control the response.
//
// A ResponseController may not be used after the [Handler.ServeHTTP] method has returned.
type ResponseController struct {
	rw ResponseWriter
}

// NewResponseController creates a [ResponseController] for a request.
//
// The ResponseWriter should be the original value passed to the [Handler.ServeHTTP] method,
// or have an Unwrap method returning the original ResponseWriter.
//
// If the ResponseWriter implements any of the following methods, the ResponseController
// will call them as appropriate:
//
//	Flush()
//	FlushError() error // alternative Flush returning an error
//	Hijack() (net.Conn, *bufio.ReadWriter, error)
//	SetReadDeadline(deadline time.Time) error
//	SetWriteDeadline(deadline time.Time) error
//	EnableFullDuplex() error
//
// If the ResponseWriter does not support a method, ResponseController returns
// an error matching [ErrNotSupported].
func NewResponseController(rw ResponseWriter) *ResponseController {
	return &ResponseController{rw}
}

type rwUnwrapper interface {
	Unwrap() ResponseWriter
}

// Flush flushes buffered data to the client.
func (c *ResponseController) Flush() error {
	rw := c.rw
	for {
		switch t := rw.(type) {
		case interface{ FlushError() error }:
			return t.FlushError()
		case Flusher:
			t.Flush()
			return nil
		case rwUnwrapper:
			rw = t.Unwrap()
		default:
			return errNotSupported()
		}
	}
}

// Hijack lets the caller take over the connection.
// See the Hijacker interface for details.
func (c *ResponseController) Hijack() (net.Conn, *bufio.ReadWriter, error) {
	rw := c.rw
	for {
		switch t := rw.(type) {
		case Hijacker:
			return t.Hijack()
		case rwUnwrapper:
			rw = t.Unwrap()
		default:
			return nil, nil, errNotSupported()
		}
	}
}

// SetReadDeadline sets the deadline for reading the entire request, including the body.
// Reads from the request body after the deadline has been exceeded will return an error.
// A zero value means no deadline.
//
// Setting the read deadline after it has been exceeded will not extend it.
func (c *ResponseController) SetReadDeadline(deadline time.Time) error {
	rw := c.rw
	for {
		switch t := rw.(type) {
		case interface{ SetReadDeadline(time.Time) error }:
			return t.SetReadDeadline(deadline)
		case rwUnwrapper:
			rw = t.Unwrap()
		default:
			return errNotSupported()
		}
	}
}

// SetWriteDeadline sets the deadline for writing the response.
// Writes to the response body after the deadline has been exceeded will not block,
// but may succeed if the data has been buffered.
// A zero value means no deadline.
//
// Setting the write deadline after it has been exceeded will not extend it.
func (c *ResponseController) SetWriteDeadline(deadline time.Time) error {
	rw := c.rw
	for {
		switch t := rw.(type) {
		case interface{ SetWriteDeadline(time.Time) error }:
			return t.SetWriteDeadline(deadline)
		case rwUnwrapper:
			rw = t.Unwrap()
		default:
			return errNotSupported()
		}
	}
}

// EnableFullDuplex indicates that the request handler will interleave reads from [Request.Body]
// with writes to the [ResponseWriter].
//
// For HTTP/1 requests, the Go HTTP server by default consumes any unread portion of
// the request body before beginning to write the response, preventing handlers from
// concurrently reading from the request and writing the response.
// Calling EnableFullDuplex disables this behavior and permits handlers to continue to read
// from the request while concurrently writing the response.
//
// For HTTP/2 requests, the Go HTTP server always permits concurrent reads and responses.
func (c *ResponseController) EnableFullDuplex() error {
	rw := c.rw
	for {
		switch t := rw.(type) {
		case interface{ EnableFullDuplex() error }:
			return t.EnableFullDuplex()
		case rwUnwrapper:
			rw = t.Unwrap()
		default:
			return errNotSupported()
		}
	}
}

// errNotSupported returns an error that Is ErrNotSupported,
// but is not == to it.
func errNotSupported() error {
	return fmt.Errorf("%w", ErrNotSupported)
}

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Editing: responsecontroller.go

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