Prior to this commit, the `HttpHeaders.writeableHttpHeaders` would only
consider headers read-only instances that were wrapped once by
`HttpHeaders.readOnlyHttpHeaders`. This does not work when other
`HttpHeaders` wrappers are involved in the chain.
This commit ensures that `writeableHttpHeaders` unwraps all headers
instances down to the actual multivalue map and create a new headers
instance out of it.
Fixes gh-33789
This commit removes all references to the Resin Servlet container, as it
is not supported as of Spring Framework 6.0 because we require a
JakartaEE baseline.
Closes gh-33772
A workaround was added for the Resin Servlet container in gh-13937.
This avoids attempting to delete parts that are not named, because the
`part.delete()` call would fail for non-file entries. This can be
problematic for files that are unnamed as they might not be removed by
the Framework.
This commit removes this workaround as Resin is not supported anymore.
Fixes gh-33511
Prior to this commit, the `DefaultServerRequestObservationConvention`
for Servlet failed when the HTTP response status was invalid (for
example, set to "0").
This commit catches `IllegalArgumentException` thrown for such invalid
HTTP status and instead returns an unknown outcome for the observation.
Fixes gh-33725
Prior to this commit, the Jackson2 decoders (JSON, Smile, CBOR) could
leak buffers in case the decoding operation times out or is cancelled
and some buffers are still in flight.
This commit ensures that buffers are released on cancel signals.
Fixes gh-33731
See gh-33715
```
Map has no value for 'thescheme'
java.lang.IllegalArgumentException: Map has no value for 'thescheme'
at org.springframework.web.util.UriComponents$MapTemplateVariables.getValue(UriComponents.java:348)
at org.springframework.web.util.UriComponents.expandUriComponent(UriComponents.java:263)
at org.springframework.web.util.HierarchicalUriComponents.expandInternal(HierarchicalUriComponents.java:436)
at org.springframework.web.util.HierarchicalUriComponents.expandInternal(HierarchicalUriComponents.java:53)
at org.springframework.web.util.UriComponents.expand(UriComponents.java:161)
at org.springframework.web.util.UriComponentsBuilder.buildAndExpand(UriComponentsBuilder.java:364)
```
Prior to this commit, our XML parser usage would be already haredened
against XXE (XML External Entities) attacks. Still, we recently received
several invalid security reports claiming that our setup should be
hardened.
This commit documents a few usages of XML parsers to add some more
context and hopefully prevent future invalid reports.
Closes gh-33713
