HTTP 429 Too Many Requests vs 525 SSL Handshake Failed
HTTP 429 (Too Many Requests) is a 4xx Client Error response, while 525 (SSL Handshake Failed) is a 5xx Server Error response. 429 indicates that the user has sent too many requests in a given time (rate limiting). The response should include a Retry-After header. In contrast, 525 means that cloudflare-specific. SSL/TLS handshake with the origin server failed.
Description
The user has sent too many requests in a given time (rate limiting). The response should include a Retry-After header.
When You See It
When hitting API rate limits or making too many requests too quickly.
How to Fix
Check the Retry-After header. Implement exponential backoff. Consider caching responses.
Description
Cloudflare-specific. SSL/TLS handshake with the origin server failed.
When You See It
When origin SSL certificate is expired, misconfigured, or incompatible.
How to Fix
Check origin SSL certificate validity. Ensure TLS version compatibility. Renew expired certificates.
Key Differences
429 is a 4xx Client Error response, while 525 is a 5xx Server Error response.
HTTP 429: The user has sent too many requests in a given time (rate limiting). The response should include a Retry-After header.
HTTP 525: Cloudflare-specific. SSL/TLS handshake with the origin server failed.
You encounter 429 when when hitting API rate limits or making too many requests too quickly.
You encounter 525 when when origin SSL certificate is expired, misconfigured, or incompatible.
When to Use Which
For 429 (Too Many Requests): Check the Retry-After header. Implement exponential backoff. Consider caching responses. For 525 (SSL Handshake Failed): Check origin SSL certificate validity. Ensure TLS version compatibility. Renew expired certificates.