benroeder opened a new issue, #7207:
URL: https://github.com/apache/opendal/issues/7207
## Describe the bug
The Swift backend does not support conditional request headers (If-Match,
If-None-Match, If-Modified-Since, If-Unmodified-Since) on stat or read
operations. The capability flags are missing and the headers are not forwarded.
HTTP 304 Not Modified is also not mapped to `ConditionNotMatch`.
## Steps to Reproduce
1. Configure a Swift backend
2. Attempt `op.stat_with("file.txt").if_match("some-etag").await`
3. The conditional header is silently ignored
## Expected Behavior
Conditional headers should be forwarded to Swift. If the condition fails,
Swift returns 304 or 412, which should map to `ConditionNotMatch`.
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