Bad Request - Header Field Too Long HTTP Error 400. A request header field is too long.

Summary

When trying to access a website, you encounter the error: Bad Request -Header Field Too Long HTTP Error 400 . A request header field is too long.

Body

Issue

Bad Request - Header Field Too Long HTTP Error 400 . A request header field is too long.

Screenshot of Error Example

Environment

Web browsers (e.g. Chrome, Edge, Firefox, Safari)

Resolution

Clear cache in Chrome: 

https://support.google.com/accounts/answer/32050?co=GENIE.Platform%3DDesktop&hl=en 

  

Clear cache in Edge: 

https://support.microsoft.com/en-us/help/10607/microsoft-edge-view-delete-browser-history 

  

Clear cache in Firefox: 

https://support.mozilla.org/en-US/kb/how-clear-firefox-cache 

  

Clear cache in Safari: 

https://support.apple.com/guide/safari/clear-your-browsing-history-sfri47acf5d6/mac 

 

Clear cache in Chrome/Firefox (MAC): 

https://help.one.com/hc/en-us/articles/115005588169-How-do-I-clear-my-browser-s-cache-on-a-Mac- 

Details

Details

Article ID: 133281
Created
Fri 7/16/21 9:34 AM
Modified
Tue 3/3/26 3:13 PM