- on HTTP versions < 1.1 support for chunked transfer is refused (only used in exploits)

- requests conflicting configured or passed SCRIPT_NAME now produce a verbose error

- Trailer fields are no longer inspected for headers indicating secure scheme

** Breaking changes **

- the limitations on valid characters in the HTTP method have been bounded to Internet Standards

- requests specifying unsupported transfer coding (order) are refused by default (rare)

- HTTP methods are no longer casefolded by default (IANA method registry contains none affacted)