VIM: Adds request syntax file

File was simply taken from my old Vim configuration.

It inherits most of the html syntax as it is set on responses as well as
requests

Also, adds some request / response specific highlighting for things like
http method etc.

nvim/.config/nvim/syntax/request.vim

@@ -0,0 +1,25 @@
+if exists("b:current_syntax")
+  finish
+endif
+runtime! syntax/html.vim
+runtime! after/syntax/html.vim
+let s:cpo_save = &cpo
+set cpo&vim
+syn keyword httpMethod  OPTIONS GET HEAD POST PUT DELETE TRACE CONNECT PATCH contained
+syn match httpProto         'HTTP/[0-9.]\+' contained
+syn match httpStatusCode    '[0-9]\{3\}' contained
+syn match httpStatus        '[0-9]\{3\} .*$' contained contains=httpStatusCode
+syn match httpHeaderKey     '^[A-Z][A-Za-z0-9\-]*:' contained
+syn match httpURILine       '^\(OPTIONS\|GET\|HEAD\|POST\|PUT\|DELETE\|TRACE\|CONNECT\|PATCH\)\( .*\)\?\(HTTP/[0-9.]\+\)\?$'  contains=httpMethod,httpProto contained
+syn match httpResponseLine  '^HTTP/[0-9.]\+ [0-9]\{3\}.*$' contains=httpProto,httpStatus contained
+syn match httpHeaderLine    '^[A-Z][A-Za-z0-9\-]*: .*$' contains=httpHeaderKey contained
+syn region httpHeader       start='^\(OPTIONS\|GET\|HEAD\|POST\|PUT\|DELETE\|TRACE\|CONNECT\|PATCH\)\( .*\)\?\(HTTP/[0-9.]\+\)\?$' end='\n\s*\n' contains=httpURILine,httpHeaderLine
+syn region httpHeader       start='^HTTP/[0-9.]\+ [0-9]\{3\}.*$' end='\n\s*\n' contains=httpResponseLine,httpHeaderLine
+hi link httpMethod      Type
+hi link httpProto       Statement
+hi link httpHeaderKey   Identifier
+hi link httpStatus      String
+hi link httpStatusCode      Number
+let b:current_syntax = 'request'
+let &cpo = s:cpo_save
+unlet s:cpo_save