使用curl仅从HTTP POST获取响应标头

Question

您只能使用HTTP HEAD请求报头，如curl(1)中的选项-i。

$ curl -I /

冗长的HTML响应体在命令行中很难得到，所以我希望只得到标题作为POST请求的反馈。但是，头和岗是两种不同的方法。

如何使curl只显示POST请求的响应头？

Answer 1

其他答案需要下载响应正文。但有一种方法可以发出只获取头的POST请求：

curl -s -I -X POST http://www.google.com

-i本身执行HEAD请求，该请求可以被-xpost覆盖，以执行POST（或任何其他）请求，并且仍然只获得header数据。

Answer 2

-D, --dump-header <file>
       Write the protocol headers to the specified file.

       This  option  is handy to use when you want to store the headers
       that a HTTP site sends to you. Cookies from  the  headers  could
       then  be  read  in  a  second  curl  invocation by using the -b,
       --cookie option! The -c, --cookie-jar option is however a better
       way to store cookies.

而且

-S, --show-error
       When used with -s, --silent, it makes curl show an error message if it fails.

而且

-L/--location
      (HTTP/HTTPS) If the server reports that the requested page has moved to a different location (indicated with a Location: header and a 3XX response
      code), this option will make curl redo the request on the new place. If used together with -i/--include or -I/--head, headers from  all  requested
      pages  will  be  shown.  When authentication is used, curl only sends its credentials to the initial host. If a redirect takes curl to a different
      host, it won’t be able to intercept the user+password. See also --location-trusted on how to change this. You can limit the amount of redirects to
      follow by using the --max-redirs option.

      When curl follows a redirect and the request is not a plain GET (for example POST or PUT), it will do the following request with a GET if the HTTP
      response was 301, 302, or 303. If the response code was any other 3xx code, curl will re-send the following  request  using  the  same  unmodified
      method.

从手册页。所以

curl -sSL -D - www.acooke.org -o /dev/null

遵循重定向，将标头转储到stdout，并将数据发送到/dev/null（这是一个GET，而不是一个POST，但您可以使用POST做同样的事情--只需添加您已经用于发布数据的任何选项）

注意-d后面的-表示输出“file”是stdout。