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   1 # class http\Header\Parser
   2
   3 The parser which is underlying http\Header and http\Message.
   4
   5 ## Changelog:
   6
   7 | Version | Change
   8 |---------|--------
   9 | 2.3.0   | Added http\Header\Parser API
  10
  11 ## Constants:
  12
  13 ### Parser flags:
  14
  15 * CLEANUP
  16   Finish up parser at end of (incomplete) input.
  17
  18 ### Parser states:
  19
  20 * STATE_FAILURE
  21   Parse failure.
  22 * STATE_START
  23   Expecting HTTP info (request/response line) or headers.
  24 * STATE_KEY
  25   Expecting a key or already parsing a key.
  26 * STATE_VALUE
  27   Expecting a value or already parsing the value.
  28 * STATE_VALUE_EX
  29   At EOL of an header, checking whether a folded header line follows.
  30 * STATE_HEADER_DONE
  31   A header was completed.
  32 * STATE_DONE
  33   Finished parsing the headers.
  34
  35 > ***NOTE:***
  36 > Most of this states won't be returned to the user, because the parser immediately jumps to the next expected state.