Editing HTTP request and response data tool (section)

=== Display HTTP headers of a web page ===
* {{Gd}} [https://www.getpostman.com/ Postman | API Development Environment]
* {{Chrome}}: Press {{kbd | key = F12}} to open the '''Developer Tools''' window -> Switch to ''Network'' panel -> Click the ''Headers'' to display the HTTP headers of a web page. (1)Section ''Query String Parameters'' for HTTP GET request (2)Section ''Form Data'' for HTTP POST request.  Further reading: [https://developers.google.com/chrome-developer-tools/docs/network?hl=zh-TW Chrome DevTools — Google Developers]
* [https://www.mozilla.org/zh-TW/firefox/new/ Firefox]: [https://developer.mozilla.org/en-US/docs/Tools/Web_Console/Opening_the_Web_Console Opening the Web Console - Firefox Developer Tools | MDN] --> Switch to "Network" label --> Click one of URLs --> Show the Headers. (formerly [http://getfirebug.com/ Firebug])

* [http://livehttpheaders.mozdev.org/ LiveHTTPHeaders] for {{Fx}}

* [http://www.ericgiguere.com/articles/masquerading-your-browser.html Masquerading Your Browser]: also offer the tool [http://www.ericgiguere.com/tools/http-header-viewer.html HTTP Header Viewer] {{access | date=2012-05-16}}

* [https://curl.haxx.se/ curl] e.g. Input the command {{kbd | key=<nowiki>curl -L -I <URL></nowiki>}}{{access | date=2018-09-20}}
** Option {{kbd | key=<nowiki>-L, --location</nowiki>}} "If the server reports that the requested page has moved to a different location (indicated with a Location: header and a 3XX response code)." quoted from [https://curl.haxx.se/docs/manpage.html manual].
** Option {{kbd | key=<nowiki>-I, --head</nowiki>}} "Fetch the headers only!" quoted from manual.

* [https://www.gnu.org/software/wget/ Wget - GNU Project - Free Software Foundation] e.g. Input the command {{kbd | key=<nowiki>wget -S --spider <URL></nowiki>}} <ref>[https://www.zyxware.com/articles/2402/viewing-http-headers-using-wget Viewing HTTP Headers using Wget | Zyxware Technologies]</ref>{{access | date=2018-09-20}}
** Option {{kbd | key=<nowiki>-S, --server-response</nowiki>}} "Print the headers sent by HTTP servers and responses sent by FTP servers." quoted from manual.
** Option {{kbd | key=<nowiki>--spider</nowiki>}} "When invoked with this option, Wget will behave as a Web spider, which means that it will not download the pages, just check that they are there." quoted from manual.

* ''$'' [https://paw.cloud/ Paw – The most advanced API tool] for {{Mac}}

Example result after executed {{kbd | key=curl}} command:
<pre>
$ curl -L -I https://www.google.com

HTTP/2 200
date: Thu, 20 Sep 2018 02:56:29 GMT
expires: -1
cache-control: private, max-age=0
content-type: text/html; charset=ISO-8859-1
p3p: CP="This is not a P3P policy! See g.co/p3phelp for more info."
server: gws
x-xss-protection: 1; mode=block
x-frame-options: SAMEORIGIN
set-cookie: 1P_JAR=2018-09-20-02; expires=Sat, 20-Oct-2018 02:56:29 GMT; path=/; domain=.google.com
set-cookie: NID=139=DXgMIx0L06ZUBLaTUD2J_pqIvfgSEo945An0URyIwGqVf_NOxPcHcaAxhNwNforv-Lw0-m6DSKX-y1wz0EhuC-tdzLHPyWYqLVOdu7VBgjH9spnMr_2MfY79uh05aYuH; expires=Fri, 22-Mar-2019 02:56:29 GMT; path=/; domain=.google.com; HttpOnly
alt-svc: quic=":443"; ma=2592000; v="44,43,39,35"
accept-ranges: none
vary: Accept-Encoding
</pre>