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How to Resolve Gmail 400 bad Request

Today while accessing Gmail & Google Apps on chrome, I encountered with the “Gmail 400 bad request”. I  tried to refresh the page & then thought about DNS cache issue ( which i have already resolved yesterday).

Anyway to crosscheck, I suddenly open the gmail on firefox & discovered that it is working fine & it have something to do with Chrome html encoding.

Gmail 400 bad request2 How to Resolve Gmail 400 bad Request

Here is the process which i have followed to resolve the Gmail 400 bad request:

Step 1: Try loading Old Standard Gmail with this address mail.google.com/mail?ui=1

Result for me: Gmail 400 bad request

Gmail 400 bad request1 How to Resolve Gmail 400 bad Request

Step 2: Try loading Gmail with Labs turned off mail.google.com/mail/?labs=0

Result for me: Bingo! It worked.

Gmail 400 bad request0 How to Resolve Gmail 400 bad Request


There are various types of html standard followed by Gmail to call the features in the web interface & sometimes the browser may create issues with a particular web formats so it is recommend to try any of the following standards.

  • New standard mail.google.com/mail?ui=2
  • Old standard mail.google.com/mail?ui=1
  • Labs turned on mail.google.com/mail/?labs=1
  • Labs turned off mail.google.com/mail/?labs=0
  • Basic HTML mail.google.com/mail/?ui=html
  • Mobile XHTML m.gmail.com


Let us know in case this doesn’t worked for you or have some better tip to share here!

Honey Singh is Head of Operations & Strategic Planning at MediaZo & VP Social/Technology at #ArmDigital. He has an experience of 8 years in designing, ideating/operating digital/social marketing strategies for global brands. You can also catch him on Foursquare, Twitter, Facebook , Google+ & Instagram.

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