(PECL pecl_http >= 0.13.0)
HttpResponse::guessContentType — Guess content type
$magic_file
   [, int $magic_mode = MAGIC_MIME
  ] )Attempts to guess the content type of supplied payload through libmagic.
If the attempt is successful, the guessed Content-Type will automatically be set as response Content-Type.
magic_filespecifies the magic.mime database to use
magic_modeflags for libmagic
   Returns the guessed content type on success or FALSE on failure.
  
Throws HttpRuntimeException, HttpInvalidParamException.