How to Handle \'upstream sent too big header\' Errors in NGINX?

Errors Encountered: Upstream Sent Too Big Header

NGINX users may encounter the following errors:

• "upstream sent too big header while reading response header from upstream"
• "http request count is zero while sending response to client"

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:

• fastcgi_buffers: Sets the number of buffers and their size for handling FastCGI requests.
• fastcgi_buffer_size: Determines the size of each buffer.

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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