Bad Request, Size of Request Header Exceeds Server Limit
Here is a sample URL that works on Microsoft Edge (current version) and receives an error message on Firefox (115.0.2): https://www.t-mobile.com/home-internet The error received from the web site when using FF is:
Bad Request Your browser sent a request that this server could not understand. Size of a request header field exceeds server limit.
FF was working with all T-Mobile pages a few months ago and now fails with this same error on most pages.
To test on Edge, I pasted the identical address that failed in FF into Edge and it worked fine so I am confident I am comparing the same web page on the two browsers.
Thanks for your help. Claude
Chosen solution
This issue can be caused by corrupted cookies or blocked cookies.
- check the permissions for the domain in the currently selected tab in "Tools -> Page Info -> Permissions"
Clear the Cache and remove the Cookies for websites that cause problems via the "3-bar" Firefox menu button (Settings).
"Remove the Cookies" for websites that cause problems:
- Settings -> Privacy & Security
Cookies and Site Data: "Manage Data"
"Clear the Cache":
- Settings -> Privacy & Security
Cookies and Site Data -> Clear Data -> [X] Cached Web Content -> Clear
- https://support.mozilla.org/en-US/kb/clear-cookies-and-site-data-firefox
- https://support.mozilla.org/en-US/kb/how-clear-firefox-cache
If clearing cookies doesn't help, it is possible that the cookies.sqlite file in the Firefox profile folder that stores the cookies got corrupted.
- rename/remove cookies.sqlite (cookies.sqlite.old) and when present delete cookies.sqlite-shm and cookies.sqlite-wal in the Firefox profile folder with Firefox closed in case cookies.sqlite got corrupted.
- https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data
All Replies (2)
Chosen Solution
This issue can be caused by corrupted cookies or blocked cookies.
- check the permissions for the domain in the currently selected tab in "Tools -> Page Info -> Permissions"
Clear the Cache and remove the Cookies for websites that cause problems via the "3-bar" Firefox menu button (Settings).
"Remove the Cookies" for websites that cause problems:
- Settings -> Privacy & Security
Cookies and Site Data: "Manage Data"
"Clear the Cache":
- Settings -> Privacy & Security
Cookies and Site Data -> Clear Data -> [X] Cached Web Content -> Clear
- https://support.mozilla.org/en-US/kb/clear-cookies-and-site-data-firefox
- https://support.mozilla.org/en-US/kb/how-clear-firefox-cache
If clearing cookies doesn't help, it is possible that the cookies.sqlite file in the Firefox profile folder that stores the cookies got corrupted.
- rename/remove cookies.sqlite (cookies.sqlite.old) and when present delete cookies.sqlite-shm and cookies.sqlite-wal in the Firefox profile folder with Firefox closed in case cookies.sqlite got corrupted.
- https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data
Erasing T Mobile cookies fixed it. Some pages worked and some failed becaus T Mobile uses two domain names so you have to find the right cookies. This was not hard and onlyone cookie had to be deleted. Thank you for all the help. Claude