> > ... > > [Tue Nov 18 18:23:28 2008] [error] [client a.b.c.d] Premature end of > > script headers: our_application.exe > > ... > > > ScriptLog might show you that your app is emitting an error message > instead of e.g. Content-Type header. > > -- >
Actually, I've _also_ just started to have an intermittent and seemingly obscure and very frustrating "premature end of script headers" problem. I'm running a python script using CGI on a local apache-served virtual host. (It' just an internal development project.) The project involves layout of some large graph network structures, which are then viewed via a web-based graph-vieweing tool. The script uses the "Pygraphviz" module ( http://networkx.lanl.gov/pygraphviz/) to generate .svg files with layouts of the graph and the "zgrviewer" applet to view the graphs. During the script, I first construct the graph. After using the pygraphviz module to do the layout of the graph as a data structure in memory, I invoke the pygraphviz method "draw", which saves the graph to an .svg on disk. Then I issue the HTML code invoking the zgrviewer applet, which uses the saved .svg file. Sometimes -- only _sometimes_ -- when the script invokes the "draw" method, I get a "premature end of script headers" problem, with error code 500. Because the .draw method is outputing a file to disk, it seems like it might be a permissions-related problem. But I can't figure out what t is easily, becuase the problem only happens occasionally. Moreover, when it happens, if I just hit "refresh" on the browser to run the script again, then it usually runs fine. I haven't been able to figure out more than this. Any suggestions greatly appreciated! Thanks, Dan
