JSON response not sent

I have two servers. Server A and server B. I use php, jquery for the programming language, Apache for the web server.

What I want to achieve: There are javascript that call this url http://serverB/someprocess.php, server B response with json whether the process 'someprocess' is TRUE or FALSE

Problem: When I test locally, it works just like I want. But when I upload the script, and when I look at firebug, there are no JSON response from server B, so the script fail.

Question: I had many problem about script work in local but in live before, but this one really confuse me. What should I check? Can you give me any clue?

Note: 'someprocess' is a php script that do process transferring data from progress DB (not postgre) via Merrant ODBC to SQL开发者_如何学JAVA Server 2000 and it took 70 seconds to finish

What I have try:

• set apache timeout to 80 seconds
• change server B response to text

the problem is cross domain ajax request

a solution is like :

jsonp

or

proxy way