HTTP 302 Found vs 520 Web Server Returned an Unknown Error
HTTP 302 (Found) is a 3xx Redirection response, while 520 (Web Server Returned an Unknown Error) is a 5xx Server Error response. 302 indicates that the resource temporarily resides at a different URL. The client should continue using the original URL for future requests. In contrast, 520 means that cloudflare-specific. The origin server returned an unexpected response that Cloudflare could not process.
Description
The resource temporarily resides at a different URL. The client should continue using the original URL for future requests.
When You See It
During A/B testing, temporary maintenance pages, or geo-based redirects.
How to Fix
Follow the Location header. Note: browsers may change POST to GET on redirect.
Description
Cloudflare-specific. The origin server returned an unexpected response that Cloudflare could not process.
When You See It
When Cloudflare receives an empty, unknown, or malformed response from the origin.
How to Fix
Check origin server logs. Ensure responses include proper headers. Verify SSL configuration.
Key Differences
302 is a 3xx Redirection response, while 520 is a 5xx Server Error response.
HTTP 302: The resource temporarily resides at a different URL. The client should continue using the original URL for future requests.
HTTP 520: Cloudflare-specific. The origin server returned an unexpected response that Cloudflare could not process.
You encounter 302 when during A/B testing, temporary maintenance pages, or geo-based redirects.
You encounter 520 when when Cloudflare receives an empty, unknown, or malformed response from the origin.
When to Use Which
For 302 (Found): Follow the Location header. Note: browsers may change POST to GET on redirect. For 520 (Web Server Returned an Unknown Error): Check origin server logs. Ensure responses include proper headers. Verify SSL configuration.