How to view HTTP Headers in Firefox?
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On the Firefox browser, you need to visit the website which you want to view the Http Header information, for example:
Open "Developer" (the tool supports programmer) by clicking "Open Menu" icon in the upper right hand corner of the browser.
Next click on "Inspector".
Select the "Network" tab, and then refresh the website.
After the website is refreshed, select any address seen on the Developer Tools and you can see Http Headers information.
* Http Request Header *
Host: www.eclipse.org User-Agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate, br Cookie: __utma=264369051.136975919.1505692345.1505692345.1510472939.2; __utmz=264369051.1505692346.1.1.utmcsr=google|utmccn=(organic)|utmcmd=organic|utmctr=(not%20provided); _ga=GA1.2.136975919.1505692345; thankyou_showing=donation; eclipse_oxygen=eclipse_oxygen; PHPSESSID=7ckmmm1j7gmu5476dgoagim2chlb7q0l; __utmb=264369051.2.10.1510472939; __utmc=264369051 Connection: keep-alive Upgrade-Insecure-Requests: 1 Cache-Control: max-age=0
* Http Response Header *
Date: Sun, 12 Nov 2017 08:01:53 GMT Server: Apache Location: /home/index.php Cache-Control: max-age=86400 Expires: Mon, 13 Nov 2017 08:01:53 GMT X-NodeID: www-vm1 X-Frame-Options: SAMEORIGIN Content-Length: 0 Keep-Alive: timeout=3, max=200 Connection: Keep-Alive Content-Type: text/html
