Errors Encountered: Upstream Sent Too Big Header
NGINX users may encounter the following errors:
Causes: Large Response Headers
These errors are typically caused by excessively large response headers from upstream servers. When NGINX attempts to read and process these large headers, it may exceed its allocated buffer size, leading to the reported errors.
Solution: Adjust NGINX Buffer Size
To resolve this issue, adjust the buffer size settings in the NGINX configuration file. This involves modifying the following parameters:
Configuration: Add the following to your configuration file:
fastcgi_buffers 16 16k; fastcgi_buffer_size 32k;
Explanation: This configuration provides 16 buffers, each with a size of 16 kilobytes (16k). The buffer size is increased to 32 kilobytes. By increasing both the number of buffers and their size, NGINX can handle larger response headers without encountering the "too big header" error.
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