Issue: SPR-13192

Issue: SPR-13191

This commit introduces the following changes:
 - The new CorsConfigurationMapping class allows to share the mapped
   CorsConfiguration logic between AbstractHandlerMapping and CorsFilter
 - In AbstractHandlerMapping, the Map<String, CorsConfiguration>
   corsConfiguration property has been renamed to corsConfigurations
 - CorsFilter allows to process CORS requests at filter level, using any
   CorsConfigurationSource implementation (for example
   CorsConfigurationMapping)

Issue: SPR-13192

Issue: SPR-13194

Issue: SPR-12960

(cherry picked from commit 673dac56)

Issue: SPR-12609

Prior to this change, the ShallowEtagHeaderFilter would use a
ResizableByteArrayOutputStream to internally write data and calculate
the ETag. While that implementation is faster than the regular
ByteArrayOutputStream (since it has a better strategy for growing the
internal buffer), a lot of buffer copying/writing still happens.

This change adds a new FastByteArrayOutputStream implementation that
internally uses a LinkedList<Byte[]> to store the content. So when
writing bytes to that OutputStream implementation, new byte[] are
added to the list when the previous ones are full. This saves most
of the instantiating/copying operations.

Note that new methods were added in DigestUtils to allow usage of
Streams instead of byte[], which is more efficient in our case.

Fixes #653

Issue: SPR-12081

Issue: SPR-12477

Issue: SPR-12414

Issue: SPR-12097

Servlet/PortletResponse supported as a resolvable dependency now (in particular for web controllers)

This feature required support for response exposure on Servlet/PortletRequestAttributes, instead of just in the Servlet/PortletWebRequest subclasses.

Issue: SPR-11795

(cherry picked from commit c97c2469)

ShallowEtagHeaderFilter writes body early on sendError/sendRedirect and interprets setContentLength/setBufferSize as a hint for capacity increase

Issue: SPR-11705
Issue: SPR-11717

Issue: SPR-11646

Revised ResizableByteArrayOutputStream as an actual subclass of ByteArrayOutputStream, and consistently applied appropriate ByteArrayOutputStream initial capacities across the codebase

Issue: SPR-11594

Prior to this commit, the ShallowEtagHeaderFilter did not use the
content length given by the content generator to set the
ByteArrayOutputStream's buffer size.
This can lead to performance issues for large content since the buffer
grows as the content is being written.

This commit adds a new ByteArrayOutputStream variant called
ResizableByteArrayOutputStream. This implementation has public methods
for modifying the internal buffer size and does not synchronize on
buffer access.
This commit also make use of this new variant in
ShallowEtagHeaderFilter.

Issue: SPR-8271

Prior to this commit, all 2xx HTTP responses were eligible for ETag
generation in ShallowEtagHeaderFilter. In some cases, this would use
CPU resources for no reason since HTTP clients would not use ETags.

This commit is an optimization and restricts ETags generation in cases
where (all conditions must be met):
- response has a 2xx status
- request is a GET
- response does not contain "no-store" in its "Cache-Control" header

Issue: SPR-11110

Issue: SPR-11413

Fix a variety of typos throughout the project, primarily in
comments (javadoc or otherwise) but also in a handful of log messages
and a couple exception messages.

ISSUE: SPR-11123

Issue: SPR-10413

Issue: SPR-10130

This reverts commit 45fa5082, reversing
changes made to a312d900.

Issue: SPR-10130

Issue: SPR-10128

Issue: SPR-10127

  find . -type f -name "*.java" -or -name "*.aj" | \
    xargs perl -p -i -e "s/[ \t]*$//g" {} \;

Issue: SPR-10127

This change introduces a new AllEncompassingFormHttpMessageConverter
class that adds JSON and XML converters for individual mime parts of
a multi-part request. The new converter is used in place of the
previously used XmlAwareFormHttpMessageConverter.

Issue: SPR-10055

OncePerRequestFilter now allows sub-classes to choose whether they
should ever get involved in processing an error dispatch.

Issue: SPR-9895

Issue: SPR-9895

Added handler argument to the signature of
AsyncHandlerInterceptor.afterConcurrentHandlingStarted(..).

Renamed AsyncWebUtils to WebAsyncUtils.

Errors when parsing the request content-type, in order to find out if
the request has form content, are translated to false.

Issue: SPR-9769