Flex uses Httpservice to send requests backwards, and how to use reserved characters for URLs (question mark, percent semicolon) in parameters

Recently using Flex to send a Httpservice request to the background, the request parameter contains the SQL wildcard character%,

Background to get the information is always incorrect, after the query learned that the original% is a reserved character URL, if the use of the need to turn to the corresponding hexadecimal value, is%25.

In addition, the plus sign, question mark and so on is also the reserved character of the URL, if use, also need to turn to the corresponding hexadecimal value, specific as follows: +%20
/%2f
? %3f
#%23
&%26