Golang Request.Trailer方法代碼示例

// RequestFromMap creates an http.Request from CGI variables.
// The returned Request's Body field is not populated.
func RequestFromMap(params map[string]string) (*http.Request, os.Error) {
	r := new(http.Request)
	r.Method = params["REQUEST_METHOD"]
	if r.Method == "" {
		return nil, os.NewError("cgi: no REQUEST_METHOD in environment")
	}

	r.Proto = params["SERVER_PROTOCOL"]
	var ok bool
	r.ProtoMajor, r.ProtoMinor, ok = http.ParseHTTPVersion(r.Proto)
	if !ok {
		return nil, os.NewError("cgi: invalid SERVER_PROTOCOL version")
	}

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

	r.Host = params["HTTP_HOST"]
	r.Referer = params["HTTP_REFERER"]
	r.UserAgent = params["HTTP_USER_AGENT"]

	if lenstr := params["CONTENT_LENGTH"]; lenstr != "" {
		clen, err := strconv.Atoi64(lenstr)
		if err != nil {
			return nil, os.NewError("cgi: bad CONTENT_LENGTH in environment: " + lenstr)
		}
		r.ContentLength = clen
	}

	if ct := params["CONTENT_TYPE"]; ct != "" {
		r.Header.Set("Content-Type", ct)
	}

	// Copy "HTTP_FOO_BAR" variables to "Foo-Bar" Headers
	for k, v := range params {
		if !strings.HasPrefix(k, "HTTP_") || skipHeader[k] {
			continue
		}
		r.Header.Add(strings.Replace(k[5:], "_", "-", -1), v)
	}

	// TODO: cookies.  parsing them isn't exported, though.

	if r.Host != "" {
		// Hostname is provided, so we can reasonably construct a URL,
		// even if we have to assume 'http' for the scheme.
		r.RawURL = "http://" + r.Host + params["REQUEST_URI"]
		url, err := http.ParseURL(r.RawURL)
		if err != nil {
			return nil, os.NewError("cgi: failed to parse host and REQUEST_URI into a URL: " + r.RawURL)
		}
		r.URL = url
	}
	// Fallback logic if we don't have a Host header or the URL
	// failed to parse
	if r.URL == nil {
		r.RawURL = params["REQUEST_URI"]
		url, err := http.ParseURL(r.RawURL)
		if err != nil {
			return nil, os.NewError("cgi: failed to parse REQUEST_URI into a URL: " + r.RawURL)
		}
		r.URL = url
	}

	// There's apparently a de-facto standard for this.
	// http://docstore.mik.ua/orelly/linux/cgi/ch03_02.htm#ch03-35636
	if s := params["HTTPS"]; s == "on" || s == "ON" || s == "1" {
		r.TLS = &tls.ConnectionState{HandshakeComplete: true}
	}

	// Request.RemoteAddr has its port set by Go's standard http
	// server, so we do here too. We don't have one, though, so we
	// use a dummy one.
	r.RemoteAddr = net.JoinHostPort(params["REMOTE_ADDR"], "0")

	return r, nil
}

func requestFromEnvironment(env map[string]string) (*http.Request, os.Error) {
	r := new(http.Request)
	r.Method = env["REQUEST_METHOD"]
	if r.Method == "" {
		return nil, os.NewError("cgi: no REQUEST_METHOD in environment")
	}
	r.Close = true
	r.Trailer = http.Header{}
	r.Header = http.Header{}

	r.Host = env["HTTP_HOST"]
	r.Referer = env["HTTP_REFERER"]
	r.UserAgent = env["HTTP_USER_AGENT"]

	// CGI doesn't allow chunked requests, so these should all be accurate:
	r.Proto = "HTTP/1.0"
	r.ProtoMajor = 1
	r.ProtoMinor = 0
	r.TransferEncoding = nil

	if lenstr := env["CONTENT_LENGTH"]; lenstr != "" {
		clen, err := strconv.Atoi64(lenstr)
		if err != nil {
			return nil, os.NewError("cgi: bad CONTENT_LENGTH in environment: " + lenstr)
		}
		r.ContentLength = clen
		r.Body = ioutil.NopCloser(io.LimitReader(os.Stdin, clen))
	}

	// Copy "HTTP_FOO_BAR" variables to "Foo-Bar" Headers
	for k, v := range env {
		if !strings.HasPrefix(k, "HTTP_") || skipHeader[k] {
			continue
		}
		r.Header.Add(strings.Replace(k[5:], "_", "-", -1), v)
	}

	// TODO: cookies.  parsing them isn't exported, though.

	if r.Host != "" {
		// Hostname is provided, so we can reasonably construct a URL,
		// even if we have to assume 'http' for the scheme.
		r.RawURL = "http://" + r.Host + env["REQUEST_URI"]
		url, err := http.ParseURL(r.RawURL)
		if err != nil {
			return nil, os.NewError("cgi: failed to parse host and REQUEST_URI into a URL: " + r.RawURL)
		}
		r.URL = url
	}
	// Fallback logic if we don't have a Host header or the URL
	// failed to parse
	if r.URL == nil {
		r.RawURL = env["REQUEST_URI"]
		url, err := http.ParseURL(r.RawURL)
		if err != nil {
			return nil, os.NewError("cgi: failed to parse REQUEST_URI into a URL: " + r.RawURL)
		}
		r.URL = url
	}
	return r, nil
}