Why do I get malformed header errors when using a MATLAB Compiler-generated standalone application as a CGI application with Apache?

I have created a standalone executable, mycgimagic.exe, with MATLAB Compiler which is being called by my web server as a CGI application. In the program I am using DISP to print out the formatted HTML.

When I use this application with Microsoft's Internet Information Services (IIS) web server it works fine. However when it is used with Apache Web Server 2.2, I receive an Internal Server Error and the following message is in the Apache log file

 malformed header from script. Bad header= : mycgimagic.exe

Answer 1

[MathWorks Support Team]

This error is caused by the automatic formatting done by the DISP command. Apache seems to be more particular about the formatting of the content-type headers in the HTML file than IIS.

To work around this issue, replace every occurrence of the DISP command with PRINTF. For example the command

disp('Content-type: text/html');

should be replaced with

fprintf(1,'Content-type: text/html\n');

After making these changes, the same program should work for both web servers.