Prior to this commit, flush calls on the output stream returned by
`ServletServerHttpResponse#getBody` would be delegated to the Servlet
response output stream.
This can cause performance issues when `HttpMessageConverter` and other
web components write and flush multiple times to the response body.
Here, the Servlet container is in a better position to flush to the
network at the optimal time and buffer the response body until then.
This is particularly true for `HttpMessageConverters` when they flush
many times the output stream, sometimes due to the underlying codec
library. Instead of revisiting the entire message converter contract, we
are here ignoring flush calls to that output stream.
This change does not affect the client side, nor the
`ServletServerHttpResponse#flush` calls.
This commit also introduces a new Spring property
`"spring.http.response.flush.enabled"` that reverts this behavior change
if necessary.
Closes gh-36385
Prior to this commit, a few implementations of the `HttpMessageConverter`
contract were inheriting from abstract classes. Those classes were
performing extra `OutputStream#flush` on the response body even though
this is the responsibility of the super class. Such abstract classes
do flush already, after delegating to the `writeInternal` method.
This commit ensures that we remove such extra calls as they tend to
waste resources for no added benefit.
Closes gh-36383
This commit updates the target type detection in
`ResourceHttpMessageConverter` to only support target types that are
relevant: `InputStreamResource` for streaming, and types assignable from
`ByteArrayResource` for non-streaming cases.
Closes gh-36368
This commit fixes the `configureMessageConverters` and
`configureMessageConvertersList` behavior.
`configureMessageConverters` was not executing consumers in their order
of registration (but in the reverse order).
`configureMessageConvertersList` was not executing multiple consumers
and was instead executing the first consumer multiple times.
This commit fixes both issues.
Fixes gh-36332
get method skips containsKey and instead checks if the enumeration
has elements, which should give the same behavior other than for
headers without values.
See gh-36334
- Optimize get method for request headers
- Update keySet methods to use custom extension of AbstractSet
- Drop use of native Tomcat headers, which could be an issue for
request and response wrappers that override header methods.
The performance of Servlet adapters should be similar for the
commonly used methods, and it should be possible to optimize
further for the future in HttpHeaders (e.g. by adding a
set alternative to put), and requesting Servlet API refinements.
Closes gh-36334
Prior to this commit, the reactive `MultipartParser` and `PartGenerator`
types were leaking memory at runtime in specific cases:
* many HTTP clients must send multipart requests to be parsed and close
the connection while uploading
* the `PartGenerator` must be configured to write file parts to
temporary files on disk
* concurrency, upload speed must be important to trigger cases where the
file system is not fast enough to consume incoming buffers
The `MultipartParser` parses and emits `BodyToken` to its sink
(here, the `PartGenerator`). By definition, Reactor's `FluxSink` when
created with `Flux.create(FluxSink)` will use a "buffer" strategy and
will queue emitted elements if they cannot be consumed.
Here, the cancellation signal does dispose internal states in the
`MultiPartParser` and `PartGenerator` but does not clear the internal
queue in `FluxSink`.
This commit ensures that an operation is registered to release buffers
on the discard event.
Fixes gh-36262
Prior to this commit, the `MediaType` and `MimeType` "copy" constructors
would not leverage the fact that the existing instance has been
validated already (types, subtype and parameters have been checked
already for errors) and the entire validation would be performed again.
This would also allocate map instances in the process.
This commit ensures that the already validated information is reused
directly and that we avoid unnessecary operations and allocations for
such constructors.
Closes gh-36318
The builder for `HttpMessageConverters` allows for auto-detection of
message converters on the classpath and their default registration when
`registerDefaults()` is called. Once called, there is no way to undo
this.
This commit adds a new `disableDefaults()` method to disable the default
registration and take full control over the list of message converters.
Closes gh-36303
Prior to this commit, the `Netty4HeadersAdapter` `MultiValueMapi#remove`
implementation would return an empty list if no value was present. This
is not consistent with other implementations.
This change ensures that `null` is returned for those cases.
Fixes gh-36226
Juergen Hoeller