Beefy Boxes and Bandwidth Generously Provided by pair Networks
Your skill will accomplish
what the force of many cannot
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
Follow this easy sequence of steps:
  1. Make sure this works:
    #!/bin/sh echo content-type: text/plain echo date
    (If you're not on Unix, you can skip this step, but this reveals a lot about the CGI setup without having to introduce the unknown of Perl.)
  2. Make sure this works:
    #!/your/path/to/perl print "Content-type: text/plain\n\n"; print "Hello world at " . localtime() . "\n";
  3. Now take your original script, and insert these right after the #! line:
    #!/your/path/to/perl BEGIN { print "Content-type: text/plain\n\n--OUTPUT--\n"; } ... rest of your script ...
    and make sure your code passes perl -c.
You should now see as the first few lines of output the exact headers and body sent by your program to the server. If the first lines up to the blank line are not nicely formatted headers, fix your script as needed. Once the headers are fixed, you can remove the BEGIN block.

Also, every time you see that sort of error, a sometimes-useful error message has been written to your web server's error log, so find that as well. If you don't have access to the server log, a simple fix is to change step three's suggestion to:

BEGIN { print "Content-type: text/plain\n\n--OUTPUT--\n"; open STDERR, ">&STDOUT"; # errors go to browser now } ... rest of your script ...
And now the error messages show up in your browser, as if your browser was the result of invoking the script as a command line.

-- Randal L. Schwartz, Perl hacker
Be sure to read my standard disclaimer if this is a reply.


In reply to On debugging "Premature End of Script" errors by merlyn
in thread Premature End of Script Headers Reasons? by justanyone

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • Outside of code tags, you may need to use entities for some characters:
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others rifling through the Monastery: (10)
    As of 2014-12-27 22:28 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      Is guessing a good strategy for surviving in the IT business?





      Results (177 votes), past polls