Defcon 10 Presentation: page_fault_tolerance_headers
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Introduction to writing spiders and agents
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<tr><td class='title' colspan='3'>Fault Tolerance: Look for redirects in headers</td></tr> <tr>
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<td><img src="HEADUMN.png" width="572" height="359" border="0" alt=""></td>
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<td width="50" valign="top" class="main_font" NOWRAP> </td>
<td valign="top" colspan="2" class="main_code"><a href='#'><font face='courier'>function get_first_page($URL)</a></td>
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<td width="50" valign="top" class="main_font" NOWRAP> </td>
<td valign="top" colspan="2" class="main_code"><a href='#'><font face='courier'> {</a></td>
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<td width="50" valign="top" class="main_font" NOWRAP> </td>
<td valign="top" colspan="2" class="main_code"><a href='#'><font face='courier'> $header = `c:\curl\curl --head $URL`;</a></td>
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<td width="50" valign="top" class="main_font" NOWRAP> </td>
<td valign="top" colspan="2" class="main_code"><a href='#'><font face='courier'> $parsed = inclusive_parse(</a></td>
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<td width="50" valign="top" class="main_font" NOWRAP> </td>
<td valign="top" colspan="2" class="main_code"><a href='#'><font face='courier'> $string=$header, </a></td>
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<td width="50" valign="top" class="main_font" NOWRAP> </td>
<td valign="top" colspan="2" class="main_code"><a href='#'><font face='courier'> $start="Location: ", </a></td>
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<td width="50" valign="top" class="main_font" NOWRAP> </td>
<td valign="top" colspan="2" class="main_code"><a href='#'><font face='courier'> $end="\n", </a></td>
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<td width="50" valign="top" class="main_font" NOWRAP> </td>
<td valign="top" colspan="2" class="main_code"><a href='#'><font face='courier'> $max_span=50</a></td>
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<td width="50" valign="top" class="main_font" NOWRAP> </td>
<td valign="top" colspan="2" class="main_code"><a href='#'><font face='courier'> );</a></td>
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<td width="50" valign="top" class="main_font" NOWRAP> </td>
<td valign="top" colspan="2" class="main_code"><a href='#'><font face='courier'> return $parsed[0];</a></td>
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<td width="50" valign="top" class="main_font" NOWRAP> </td>
<td valign="top" colspan="2" class="main_code"><a href='#'><font face='courier'> }</a></td>
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