HTTP 300 Multiple Choices vs 526 Invalid SSL Certificate
HTTP 300 (Multiple Choices) is a 3xx Redirection response, while 526 (Invalid SSL Certificate) is a 5xx Server Error response. 300 indicates that the request has more than one possible response. The client should choose one of them. In contrast, 526 means that cloudflare-specific. The origin's SSL certificate could not be validated.
Description
The request has more than one possible response. The client should choose one of them.
When You See It
When a resource is available in multiple formats (e.g., different languages or media types).
How to Fix
Select the appropriate resource variant. Send an Accept header with your preferred content type.
Description
Cloudflare-specific. The origin's SSL certificate could not be validated.
When You See It
When using Cloudflare Full (Strict) mode with an invalid origin certificate.
How to Fix
Install a valid SSL certificate on the origin, or use Cloudflare Origin CA certificate.
Key Differences
300 is a 3xx Redirection response, while 526 is a 5xx Server Error response.
HTTP 300: The request has more than one possible response. The client should choose one of them.
HTTP 526: Cloudflare-specific. The origin's SSL certificate could not be validated.
You encounter 300 when when a resource is available in multiple formats (e.g., different languages or media types).
You encounter 526 when when using Cloudflare Full (Strict) mode with an invalid origin certificate.
When to Use Which
For 300 (Multiple Choices): Select the appropriate resource variant. Send an Accept header with your preferred content type. For 526 (Invalid SSL Certificate): Install a valid SSL certificate on the origin, or use Cloudflare Origin CA certificate.