End of script output before headers when trying to open file on Apache [Cloud9IDE]

Question

I am trying to edit a file using CGI C outside of cgi-bin (~/workspace/files/html) and I tried opening the using this code (edited workspacename and user):

pfile = fopen("https://workspacename-user.c9users.io/files/html/output.html", "w");

I get an internal server error and when I checked the error logs it showed:

[Wed Oct 05 18:40:12.350766 2016] [cgi:error] [pid 28008] [client 10.240.0.213:54468] End of script output before headers: test.cgi, referer: https://workspacename-user.c9users.io/files/html/main.html

I tried changing the location of the file that I am trying to open to the cgi-bin directly:

pfile = fopen("output.html", "w");

and it seemed to work. Is there a way to solve this?

You can't fopen() a URL in C (maybe you're used to PHP?). You need to give it a normal file system path. — Dmitri
– Dmitri, Commented Oct 5, 2016 at 19:19
"fopen accepts paths that are valid on the file system at the point of execution". Please see fopen — Weather Vane
– Weather Vane, Commented Oct 5, 2016 at 19:19

Zipf · Accepted Answer · 2016-10-05 19:29:13Z

1

As it turns out, fopen cannot accept URLs. I tried editing the code to:

pfile = fopen("../../../home/ubuntu/workspace/files/html/output.html", "w");

and it worked.

answered Oct 5, 2016 at 19:29

Zipf

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