string conversion according to the "RFC 2068" specification???

Hi! I tested the curl connection using the bash shell on unix and it work just great. Then I move the test script over to PHP and test it. I got the error! The error message I got is .... --clip-- Error 400--Bad Request From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1: 10.4.1 400 Bad Request The request could not be understood by the server due to malformed syntax. The client SHOULD NOT repeat the request without modifications. --clip-- The problem is the string is okay since it work in the bash shell. So, I think I need to convert the string into something like URL Encode or something. Does RFC 2068 tell us I need to convert the string to this RFC specification?? Thanks, FletchSOD