本文翻译自：How are parameters sent in an HTTP POST request?
In an HTTPGETrequest, parameters are sent as aquery string:在HTTPGET请求中，参数作为查询字符串发送：
/page?parameter=value&also=another
In an HTTPPOSTrequest, the parameters are not sent along with the URI.在HTTPPOST请求中，参数不会与URI一起发送。
Where are the values?价值在哪里？In the request header?在请求标头中？In the request body?在请求正文中？What does it look like?它是什么样子的？
#1楼
参考：/question/z3Qg/如何在HTTP-POST请求中发送参数
#2楼
Form values in HTTP POSTs are sent in the request body, in the same format as the querystring.HTTP POST中的表单值以与查询字符串相同的格式在请求正文中发送。
For more information, see the spec .有关更多信息，请参见规范 。
#3楼
The content is put after the HTTP headers.内容放在HTTP标头之后。The format of an HTTP POST is to have the HTTP headers, followed by a blank line, followed by the request body.HTTP POST的格式为具有HTTP标头，后跟空白行，然后是请求正文。The POST variables are stored as key-value pairs in the body.POST变量作为键值对存储在主体中。
You can see this in the raw content of an HTTP Post, shown below:您可以在HTTP Post的原始内容中看到这一点，如下所示：
POST /path/script.cgi HTTP/1.0From: frog@User-Agent: HTTPTool/1.0Content-Type: application/x-www-form-urlencodedContent-Length: 32home=Cosby&favorite+flavor=flies
You can see this using a tool like Fiddler , which you can use to watch the raw HTTP request and response payloads being sent across the wire.您可以使用Fiddler之类的工具来查看此信息，该工具可用于观察通过网络发送的原始HTTP请求和响应有效负载。
#4楼
You cannot type it directly on the browser URL bar.您不能直接在浏览器URL栏上键入它。
You can see how POST data is sent on the Internet with Live HTTP Headers for example.例如，您可以查看如何使用实时HTTP标头在Internet上发送POST数据。Result will be something like that结果将是这样的
http://127.0.0.1/pass.phpPOST /pass.php HTTP/1.1Host: 127.0.0.1User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/0101 Firefox/18.0Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8Accept-Language: en-US,en;q=0.5Accept-Encoding: gzip, deflateDNT: 1Referer: http://127.0.0.1/pass.phpCookie: passx=87e8af376bc9d9bfec2c7c0193e6af70; PHPSESSID=l9hk7mfh0ppqecg8gialak6gt5Connection: keep-aliveContent-Type: application/x-www-form-urlencodedContent-Length: 30username=zurfyx&pass=password
Where it says它说的地方
Content-Length: 30username=zurfyx&pass=password
will be the post values.将是职位价值。
#5楼
The values are sent in the request body, in the format that the content type specifies.值以内容类型指定的格式在请求正文中发送。
Usually the content type isapplication/x-www-form-urlencoded, so the request body uses the same format as the query string:通常，内容类型为application/x-www-form-urlencoded，因此请求正文使用与查询字符串相同的格式：
parameter=value&also=another
When you use a file upload in the form, you use themultipart/form-dataencoding instead, which has a different format.当您使用表单上载文件时，将改用multipart/form-data编码，格式不同。It's more complicated, but you usually don't need to care what it looks like, so I won't show an example, but it can be good to know that it exists.它更复杂，但是您通常不需要关心它的外观，因此我不会显示示例，但是知道它的存在可能会很好。
#6楼
The default media type in a POST request isapplication/x-www-form-urlencoded.POST请求中的默认媒体类型为application/x-www-form-urlencoded。This is a format for encoding key-value pairs.这是用于编码键值对的格式。The keys can be duplicate.密钥可以重复。Each key-value pair is separated by an&character, and each key is separated from its value by an=character.每个键值对均以&字符分隔，每个键与其值之间以=字符分隔。
For example:例如：
Name: John SmithGrade: 19
Is encoded as:编码为：
Name=John+Smith&Grade=19
This is placed in the request body after the HTTP headers.它放在HTTP标头之后的请求正文中。
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