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- http - if-modified-since vs if-none-match - Stack Overflow
If-Modified-Since is compared to the Last-Modified whereas If-None-Match is compared to ETag Both Modified-Since and ETag can be used to identify a specific variant of a resource
- http - If-Modified-Since vs. If-None-Match - Server Fault
When the method is GET or HEAD, If-None-Match is not present, and If-Modified-Since is present, evaluate the If-Modified-Since precondition: * if true, continue to step 5 * if false, respond 304 (Not Modified) 5 When the method is GET and both Range and If-Range are present, evaluate the If-Range precondition:
- If-None-Match header - HTTP | MDN
The HTTP If-None-Match request header makes a request conditional The server returns the requested resource in GET and HEAD methods with a 200 status, only if it doesn't have an ETag matching the ones in the If-None-Match header
- How to retrieve or copy objects based on metadata with conditional . . .
If-None-Match — Return the object only if its ETag does not matches the one provided If-Unmodified-Since — Return the object only if it has not been modified since the time specified
- If-None-Match - Expert Guide to HTTP headers
The HTTP If-None-Match request header is used to transform the HTTP request into one that is conditional based on a set of HTTP ETag headers not matching
- In-Depth Guide to ETag, If-Match, and If-None-Match Headers in . . . - Medium
If-None-Match: The server returns a 200 OK status only if the specified condition or ETag does not match the current version on the server
- Conditional Operations with Headers :: Spring Data REST
Adjust PUT PATCH DELETE operations to use If-Match and also handle HTTP 412 Precondition Failed status codes Adjust GET operations to use If-None-Match and If-Modified-Since and handle HTTP 304 Not Modified status codes
- If-None-Match HTTP Header: What You Need to Know
Implementing the If-None-Match HTTP header is relatively straightforward The header is used to check whether a resource has changed since the last time it was requested If the resource hasn’t changed, the server can return a 304 Not Modified response, which saves bandwidth and reduces server load
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