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<H2><A NAME="SECTION00132100000000000000000">
11.2.10 Common problems and solutions</A>
</H2>

<P>

<UL>
<LI>Most HTTP servers buffer the output from CGI scripts until the
script is completed.  This means that it is not possible to display a
progress report on the client's display while the script is running.

<P>
</LI>
<LI>Check the installation instructions above.

<P>
</LI>
<LI>Check the HTTP server's log files.  ("<tt class="samp">tail -f logfile</tt>" in a
separate window may be useful!)

<P>
</LI>
<LI>Always check a script for syntax errors first, by doing something
like "<tt class="samp">python script.py</tt>".

<P>
</LI>
<LI>If your script does not have any syntax errors, try adding
"<tt class="samp">import cgitb; cgitb.enable()</tt>" to the top of the script.

<P>
</LI>
<LI>When invoking external programs, make sure they can be found.
Usually, this means using absolute path names -- <a class="envvar" id='l2h-3176' xml:id='l2h-3176'>PATH</a> is
usually not set to a very useful value in a CGI script.

<P>
</LI>
<LI>When reading or writing external files, make sure they can be read
or written by the userid under which your CGI script will be running:
this is typically the userid under which the web server is running, or some
explicitly specified userid for a web server's "<tt class="samp">suexec</tt>" feature.

<P>
</LI>
<LI>Don't try to give a CGI script a set-uid mode.  This doesn't work on
most systems, and is a security liability as well.
</LI>
</UL>

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	2	<html>
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	4	<link rel="STYLESHEET" href="lib.css" type='text/css' />
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	8	<link rel='contents' href='contents.html' title="Contents" />
	9	<link rel='index' href='genindex.html' title='Index' />
	10	<link rel='last' href='about.html' title='About this document...' />
	11	<link rel='help' href='about.html' title='About this document...' />
	12	<link rel="prev" href="node478.html" />
	13	<link rel="parent" href="module-cgi.html" />
	14	<link rel="next" href="module-cgitb.html" />
	15	<meta name='aesop' content='information' />
	16	<title>11.2.10 Common problems and solutions</title>
	17	</head>
	18	<body>
	19	<DIV CLASS="navigation">
	20	<div id='top-navigation-panel' xml:id='top-navigation-panel'>
	21	<table align="center" width="100%" cellpadding="0" cellspacing="2">
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	23	<td class='online-navigation'><a rel="prev" title="11.2.9 Debugging CGI scripts"
	24	href="node478.html"><img src='../icons/previous.png'
	25	border='0' height='32' alt='Previous Page' width='32' /></A></td>
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	40	border='0' height='32' alt='Index' width='32' /></A></td>
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	44	<a class="sectref" rel="prev" href="node478.html">11.2.9 Debugging CGI scripts</A>
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	46	<a class="sectref" rel="parent" href="module-cgi.html">11.2 cgi </A>
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	53
	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>
102	</UL>
103
104	<DIV CLASS="navigation">
105	<div class='online-navigation'>
106	<p></p><hr />
107	<table align="center" width="100%" cellpadding="0" cellspacing="2">
108	<tr>
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110	href="node478.html"><img src='../icons/previous.png'
111	border='0' height='32' alt='Previous Page' width='32' /></A></td>
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113	href="module-cgi.html"><img src='../icons/up.png'
114	border='0' height='32' alt='Up One Level' width='32' /></A></td>
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116	href="module-cgitb.html"><img src='../icons/next.png'
117	border='0' height='32' alt='Next Page' width='32' /></A></td>
118	<td align="center" width="100%">Python Library Reference</td>
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121	border='0' height='32' alt='Contents' width='32' /></A></td>
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130	<a class="sectref" rel="prev" href="node478.html">11.2.9 Debugging CGI scripts</A>
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132	<a class="sectref" rel="parent" href="module-cgi.html">11.2 cgi </A>
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134	<a class="sectref" rel="next" href="module-cgitb.html">11.3 cgitb </A>
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137	<hr />
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