Problem:
Using the DISPLAY verb in a CGI program gives an Interrnal Server Error 500 when deployed using the Apache web server, however the same DISPLAY works fine with other web servers such as Solo.
Resolution:
The problem is with the way that Apache works rather than Server Express. The following can be found on the Apache website:
http://httpd.apache.org/docs/2.2/howto/cgi.html#writing
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There are two main differences between "regular'' programming, and CGI programming.
First, all output from your CGI program must be preceded by a MIME-type header. This is HTTP header that tells the client what sort of content it is receiving. Most of the time, this will look like:
Content-type: text/html
Secondly, your output needs to be in HTML, or some other format that a browser will be able to display. Most of the time, this will be HTML, but occasionally you might write a CGI program that outputs a gif image, or other non-HTML content.
Apart from those two things, writing a CGI program will look a lot like any other program that you might write.
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So, just doing a DISPLAY "anything" won't have the MIME type & so isn't in a browser compatible format. Therfore Apache throws the error 500.
There are two programatic work-arounds to this problem:
1. Use EXEC HTML DISPLAY "something" END-EXEC as this will send a HTML header.
2. Use DISPLAY ws-myform at the beginning of the program where ws-myform is declared as:
01 ws-myform is external-form identified by "headerl.html".
and header.html containes <html>. The other DISPLAY's in the program can remain unchanged.
