HTTP 1.0 provides only the last-modified date to validate that a document has not changed since last fetched (via use of an If-Modified-Since header added to the request). Last-Modified dates, however, only have resolution to one second, which prevents correct caching of documents that can change more than once per second. HTTP 1.1 adds "entity tags" to support correct validation of such documents and to support caching of documents for which last-modified-date is not an appropriate validation mechanism. HTTP 1.1 compliance mandates that clients make use of entity tags for validation if they are present (via addition of an If-Match header to the request). See this link for info on the use of entity tags in HTTP validation: http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.3.4
The fix for this bug is pretty trivial. I've added a patch attachment containing the fix.
Bulk move of all Cache (to be deleted component) bugs to new Networking: Cache component.
The header is actually If-None-Match, not If-Match, so don't blindly apply the first patch given.
Status: NEW → RESOLVED
Last Resolved: 19 years ago
Resolution: --- → FIXED
Fix checked into nsHTTPChannel.cpp rev 1.115
Status: RESOLVED → VERIFIED
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