HTTP400 error on selected images across DDB

#1 Jan 15, 2026
ForeverBM
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Certain images simply do not render and the site displays a HTTP400, as a result the page just shows the ALT text.
For example the portrait picture of the Scarecrow on this page: https://www.dndbeyond.com/monsters/17200-scarecrow

This image has the URL: https://www.dndbeyond.com/avatars/thumbnails/30835/821/1000/1000/638063922184805878.png
Accessing this URL in Chrome & Postman works.
In Chrome it returns a 400 and an XML error message:

<Error>
<Code>RequestHeaderSectionTooLarge</Code>
<Message>Your request header section exceeds the maximum allowed size.</Message>
<MaxSizeAllowed>8192</MaxSizeAllowed>
<RequestId>8962RTKMPVTTXREV</RequestId>
<HostId>7Q43MUlVnEjJpJ96Bq90jN/kvogLAevnU5pZFfgkSKvunlozNipPWPEoQI7SFF4f6lVEtsKsc1U=</HostId>
</Error>

Using - Chrome Version 144.0.7559.60 (Official Build) (64-bit)

All cookies deleted
Entire cache removed and chrome reinstalled.
Error has been present since December 2025.

An alternate error image is this : https://www.dndbeyond.com/avatars/54366/134/1581111423-160019172.jpeg?width=150&height=150&fit=crop&quality=95&auto=webp 
Which gives the same error.
Last edited by ForeverBM: Jan 25, 2026

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#2 Jan 16, 2026
wagnarokkr
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Issues with the request header being too large can often be solved by clearing the cookies (for dndbeyond.com specifically) in your browser's settings and then restarting your browser completely. (You'll need to login again.)

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pronouns: he/she/they
#3 Jan 25, 2026
ForeverBM
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This is an error that has happened to others: https://www.dndbeyond.com/forums/d-d-beyond-general/bugs-support/156019-images-failing-to-load-on-website?srsltid=AfmBOooZy7NhaQDJt9f-xWPXFW7Nx2R6GsTNnrnU5SxTX-FXYF9FSaZP

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#4 Jan 25, 2026
ForeverBM
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This error can be reproduced in post man by adding these headers:
Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Accept-Encoding:gzip, deflate, br, zstd
Accept-Language:en-GB,en-US;q=0.9,en;q=0.8
//Cache-Control:max-age=0
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Upgrade-Insecure-Requests:1
priority:u=0, i
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sec-ch-ua-mobile:?0
sec-ch-ua-platform:"Windows"
sec-fetch-dest:document
sec-fetch-mode:navigate
sec-fetch-site:none
sec-fetch-user:?1

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#5 Jan 30, 2026
ForeverBM
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After spending some time attempting to diagnose this issues I found that ddb had stored 70 cookies on my PC when using Chrome.
I compared to the number when using a cleaned version of Edge - there were only 46 cookies sent by Edge.
Using a cookie cleaner and logging back into ddb I found that all the images appear.

Now when I count the cookies there are only 43 cookies in Chrome and it now works fine.

I can only conclude that the ddb server which is serves https://www.dndbeyond.com/avatars does not like the extra header length.
AND if you use ddb for too long (months) it accumulates a lot of crap cookies!!!

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