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