case sensitive

* Clarify server handling when upload length is exceeded.

* Extend security considerations about upload resource URIs, representation metadata, and untrusted inputs.
* Allow clients to retry for appropriate 4xx responses.

Merge pull request #3016 from httpwg/mnot/cgadjust

32 x 32

Version 01

* Minor editorial improvements to introduction and examples.

* Define structured types for new header fields.

Merge pull request #3033 from httpwg/resumable-upload/headers-registr…

…y-sf

Define structured types for header fields