Fails on one site through the proxy
Likely causes
- - Bloated cookies for that site
- - Target sends very large headers
Verified remedy
Clear cookies for the domain and retry; if direct also fails, it is the target headers.
Proxy troubleshooting
Fix ERR_RESPONSE_HEADERS_TOO_BIG through a proxy
Ranked causes, ordered diagnostics, and a verified remedy for ERR_RESPONSE_HEADERS_TOO_BIG - ending with a final connection check.
Quick answer
Fix: response headers exceed the limit. Clear cookies for the site, remove header-injecting tools from the path, and retry through the endpoint.
Exact symptom text
Causes ranked by likelihood
Ordered diagnostics
Final connection check
When this is the right fit
- Exact symptom text
- Causes ranked by likelihood
- Ordered diagnostics
Who this page is for
Ranked causes, ordered diagnostics, and a verified remedy for ERR_RESPONSE_HEADERS_TOO_BIG - ending with a final connection check.
Fix: response headers exceed the limit. Clear cookies for the site, remove header-injecting tools from the path, and retry through the endpoint.
Diagnosis tree
Final connection check
- 1Clear cookies
- 2Disable header-modifying extensions
- 3Retry through the endpoint
- 4Confirm the exit IP is the assigned endpoint
Working connection
The page loads through the endpoint.
Broken connection
If direct also fails with the same error, the target itself exceeds limits.
Sources
Facts last reviewed 2026-09-01.
Prevent it recurring
Keep one profile on one static endpoint and avoid stacking header-modifying extensions on managed profiles.
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Frequently asked questions
How do I fix ERR_RESPONSE_HEADERS_TOO_BIG?
Clear the site's cookies, disable header-injecting extensions, and retry. The limit is exceeded by the total header size, usually cookies.
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