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54 | <H2><A NAME="SECTION00132100000000000000000"> | |
55 | 11.2.10 Common problems and solutions</A> | |
56 | </H2> | |
57 | ||
58 | <P> | |
59 | ||
60 | <UL> | |
61 | <LI>Most HTTP servers buffer the output from CGI scripts until the | |
62 | script is completed. This means that it is not possible to display a | |
63 | progress report on the client's display while the script is running. | |
64 | ||
65 | <P> | |
66 | </LI> | |
67 | <LI>Check the installation instructions above. | |
68 | ||
69 | <P> | |
70 | </LI> | |
71 | <LI>Check the HTTP server's log files. ("<tt class="samp">tail -f logfile</tt>" in a | |
72 | separate window may be useful!) | |
73 | ||
74 | <P> | |
75 | </LI> | |
76 | <LI>Always check a script for syntax errors first, by doing something | |
77 | like "<tt class="samp">python script.py</tt>". | |
78 | ||
79 | <P> | |
80 | </LI> | |
81 | <LI>If your script does not have any syntax errors, try adding | |
82 | "<tt class="samp">import cgitb; cgitb.enable()</tt>" to the top of the script. | |
83 | ||
84 | <P> | |
85 | </LI> | |
86 | <LI>When invoking external programs, make sure they can be found. | |
87 | Usually, this means using absolute path names -- <a class="envvar" id='l2h-3176' xml:id='l2h-3176'>PATH</a> is | |
88 | usually not set to a very useful value in a CGI script. | |
89 | ||
90 | <P> | |
91 | </LI> | |
92 | <LI>When reading or writing external files, make sure they can be read | |
93 | or written by the userid under which your CGI script will be running: | |
94 | this is typically the userid under which the web server is running, or some | |
95 | explicitly specified userid for a web server's "<tt class="samp">suexec</tt>" feature. | |
96 | ||
97 | <P> | |
98 | </LI> | |
99 | <LI>Don't try to give a CGI script a set-uid mode. This doesn't work on | |
100 | most systems, and is a security liability as well. | |
101 | </LI> | |
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138 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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