"env-PATH_INFO":         "",
		"env-QUERY_STRING":      "foo=bar&a=b",
		"env-REMOTE_ADDR":       "1.2.3.4",
		"env-REMOTE_HOST":       "1.2.3.4",
		"env-REMOTE_PORT":       "1234",
		"env-REQUEST_METHOD":    "GET",
		"env-REQUEST_URI":       "/test.cgi?foo=bar&a=b",
		"env-SCRIPT_FILENAME":   os.Args[0],
		"env-SCRIPT_NAME":       "/test.cgi",
		"env-SERVER_NAME":       "example.com",

	for i := range p {
		p[i] = byte(b)
	}
	return len(p), nil
}

// childCGIProcess is used by integration_test to complete unit tests.
func childCGIProcess() {
	if os.Getenv("REQUEST_METHOD") == "" {
		// Not in a CGI environment; skipping test.
		return
	}
	switch os.Getenv("REQUEST_URI") {
	case "/immediate-disconnect":
		os.Exit(0)
	case "/no-content-type":

	// ignored.
	NoProxy string

	// CGI holds whether the current process is running
	// as a CGI handler (FromEnvironment infers this from the
	// presence of a REQUEST_METHOD environment variable).
	// When this is set, ProxyForURL will return an error
	// when HTTPProxy applies, because a client could be
	// setting HTTP_PROXY maliciously. See https://golang.org/s/cgihttpproxy.
	CGI bool
}

		port = matches[1]
	}

	env := []string{
		"SERVER_SOFTWARE=go",
		"SERVER_PROTOCOL=HTTP/1.1",
		"HTTP_HOST=" + req.Host,
		"GATEWAY_INTERFACE=CGI/1.1",
		"REQUEST_METHOD=" + req.Method,
		"QUERY_STRING=" + req.URL.RawQuery,
		"REQUEST_URI=" + req.URL.RequestURI(),
		"PATH_INFO=" + pathInfo,
		"SCRIPT_NAME=" + root,
		"SCRIPT_FILENAME=" + h.Path,
		"SERVER_PORT=" + port,
	}

type proxyFromEnvTest struct {
	req string // URL to fetch; blank means "http://example.com"

	env      string // HTTP_PROXY
	httpsenv string // HTTPS_PROXY
	noenv    string // NO_PROXY
	reqmeth  string // REQUEST_METHOD

	want    string
	wanterr error
}

func (t proxyFromEnvTest) String() string {
	var buf strings.Builder
	space := func() {
		if buf.Len() > 0 {
			buf.WriteByte(' ')
		}