一起看一下golang的HTTP包怎么write Request信息

先看一下看golang http Request的struct，不解释，慢慢看（HTTP权威指南，，RFC文档）

type Request struct { // Method specifies the HTTP method (GET, POST, PUT, etc.). // For client requests an empty string means GET. Method string // URL specifies either the URI being requested (for server // requests) or the URL to access (for client requests). // // For server requests the URL is parsed from the URI // supplied on the Request-Line as stored in RequestURI. For // most requests, fields other than Path and RawQuery will be // empty. (See RFC 2616, Section 5.1.2) // // For client requests, the URL‘s Host specifies the server to // connect to, while the Request‘s Host field optionally // specifies the Host header value to send in the HTTP // request. URL *url.URL // The protocol version for incoming requests. // Client requests always use HTTP/1.1. Proto string // "HTTP/1.0" ProtoMajor int // 1 ProtoMinor int // 0 // A header maps request lines to their values. // If the header says // // accept-encoding: gzip, deflate // Accept-Language: en-us // Connection: keep-alive // // then // // Header = map[string][]string{ // "Accept-Encoding": {"gzip, deflate"}, // "Accept-Language": {"en-us"}, // "Connection": {"keep-alive"}, // } // // HTTP defines that header names are case-insensitive. // The request parser implements this by canonicalizing the // name, making the first character and any characters // following a hyphen uppercase and the rest lowercase. // // For client requests certain headers are automatically // added and may override values in Header. // // See the documentation for the Request.Write method. Header Header // Body is the request‘s body. // // For client requests a nil body means the request has no // body, such as a GET request. The HTTP Client‘s Transport // is responsible for calling the Close method. // // For server requests the Request Body is always non-nil // but will return EOF immediately when no body is present. // The Server will close the request body. The ServeHTTP // Handler does not need to. Body io.ReadCloser // ContentLength records the length of the associated content. // The value -1 indicates that the length is unknown. // Values >= 0 indicate that the given number of bytes may // be read from Body. // For client requests, a value of 0 means unknown if Body is not nil. ContentLength int64 // TransferEncoding lists the transfer encodings from outermost to // innermost. An empty list denotes the "identity" encoding. // TransferEncoding can usually be ignored; chunked encoding is // automatically added and removed as necessary when sending and // receiving requests. TransferEncoding []string // Close indicates whether to close the connection after // replying to this request (for servers) or after sending // the request (for clients). Close bool // For server requests Host specifies the host on which the // URL is sought. Per RFC 2616, this is either the value of // the "Host" header or the host name given in the URL itself. // It may be of the form "host:port". // // For client requests Host optionally overrides the Host // header to send. If empty, the Request.Write method uses // the value of URL.Host. Host string // Form contains the parsed form data, including both the URL // field‘s query parameters and the POST or PUT form data. // This field is only available after ParseForm is called. // The HTTP client ignores Form and uses Body instead. Form url.Values // PostForm contains the parsed form data from POST or PUT // body parameters. // This field is only available after ParseForm is called. // The HTTP client ignores PostForm and uses Body instead. PostForm url.Values // MultipartForm is the parsed multipart form, including file uploads. // This field is only available after ParseMultipartForm is called. // The HTTP client ignores MultipartForm and uses Body instead. MultipartForm *multipart.Form // Trailer specifies additional headers that are sent after the request // body. // // For server requests the Trailer map initially contains only the // trailer keys, with nil values. (The client declares which trailers it // will later send.) While the handler is reading from Body, it must // not reference Trailer. After reading from Body returns EOF, Trailer // can be read again and will contain non-nil values, if they were sent // by the client. // // For client requests Trailer must be initialized to a map containing // the trailer keys to later send. The values may be nil or their final // values. The ContentLength must be 0 or -1, to send a chunked request. // After the HTTP request is sent the map values can be updated while // the request body is read. Once the body returns EOF, the caller must // not mutate Trailer. // // Few HTTP clients, servers, or proxies support HTTP trailers. Trailer Header // RemoteAddr allows HTTP servers and other software to record // the network address that sent the request, usually for // logging. This field is not filled in by ReadRequest and // has no defined format. The HTTP server in this package // sets RemoteAddr to an "IP:port" address before invoking a // handler. // This field is ignored by the HTTP client. RemoteAddr string // RequestURI is the unmodified Request-URI of the // Request-Line (RFC 2616, Section 5.1) as sent by the client // to a server. Usually the URL field should be used instead. // It is an error to set this field in an HTTP client request. RequestURI string // TLS allows HTTP servers and other software to record // information about the TLS connection on which the request // was received. This field is not filled in by ReadRequest. // The HTTP server in this package sets the field for // TLS-enabled connections before invoking a handler; // otherwise it leaves the field nil. // This field is ignored by the HTTP client. TLS *tls.ConnectionState }