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On this page, you will find more information about the most common causes and most relevant solutions for the Pantheon error 'Upstream sent too big header'. Do you need help straight away? Visit our support page.
Error information
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Category
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Error codeUpstream sent too big header
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Similar errorsUpstream sent too big header while reading response header from upstream.
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ProductPantheon
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DeveloperPantheon
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Operating system-
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Platform-
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First seenSeptember 11, 2021
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VerifiedYes
What causes the Upstream sent too big header error?
The Pantheon documentation indicates that error code 'Upstream sent too big header' is caused by the following problem: "This error will occur when the payload or size of the request being sent is greater than the fastcgi_buffer_size.".
Do you think there is another cause for this error? Let others know in the comments.
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