<dt>base for relative URLs in HTML documents: <a href="../ch02_04.htm#INDEX-386">2.4.2.1. Content-Base</a></dt>      <a name="bookmarklets-JavaScript">  <dt>bookmarklets, JavaScript: <a href="../ch07_04.htm#INDEX-1613">7.4. Bookmarklets</a></dt>      <a name="breaking-into-components-with-URI-module">  <dt>breaking into components with URI module: <a href="../ch14_01.htm#INDEX-2697">14.1.2. IO::Socket</a></dt>      <a name="CGI-scripts">  <dt>CGI scripts: <a href="../ch01_02.htm#INDEX-65">1.2.2. Invoking CGI Scripts</a></dt><dd><dl>    <a name="calling-from-self_url-method-and">    <dt>calling from, self_url method and: <a href="../ch05_02.htm#INDEX-985">5.2.1.5. &#10;self_url</a></dt>        <a name="pointing-to-with-tag">    <dt>pointing to with tag: <a href="../ch05_03.htm#INDEX-1113">5.3.2.1. start_html</a></dt>        <a name="specifying-for-receiving-HTTP-requests">    <dt>specifying for receiving HTTP requests: <a href="../ch04_02.htm#INDEX-778">4.2.2. The &lt;FORM> Tag</a></dt>      </dl></dd>      <a name="components-of">  <dt>components of: <a href="../ch02_01.htm#INDEX-180">2.1.1. Elements of a URL</a></dt><dd><dl>    <a name="fragment-identifiers">    <dt>fragment identifiers: <a href="../ch02_01.htm#INDEX-211">2.1.1. Elements of a URL</a></dt>        <a name="hosts">    <dt>hosts: <a href="../ch02_01.htm#INDEX-185">2.1.1. Elements of a URL</a></dt>        <a name="path-information">    <dt>path information: <a href="../ch02_01.htm#INDEX-194">2.1.1. Elements of a URL</a></dt>        <a name="port-numbers">    <dt>port numbers: <a href="../ch02_01.htm#INDEX-191">2.1.1. Elements of a URL</a></dt>        <a name="scheme-protocol">    <dt>scheme (protocol): <a href="../ch02_01.htm#INDEX-182">2.1.1. Elements of a URL</a></dt>      </dl></dd>      <a name="to-embpcgi.pl-script">  <dt>to embpcgi.pl script: <a href="../ch06_04.htm#INDEX-1398">6.4.1.3. embpcgi.pl</a></dt>      <a name="encoded-characters">  <dt>encoded characters: <a href="../ch04_03.htm#INDEX-900">4.3. Decoding Form Input</a></dt>      <a name="encoding-characters-in">  <dt>encoding characters in: <a href="../ch02_01.htm#INDEX-225">2.1.3. URL Encoding</a></dt><dd><dl>    <a name="URI-:-:URL-module">    <dt>URI::URL module: <a href="../ch02_01.htm#INDEX-243">2.1.3. URL Encoding</a></dt>      </dl></dd>      <a name="forwarding-users-to-with-Location-header">  <dt>forwarding users to with Location header: <a href="../ch03_03.htm#INDEX-590">3.3.1.2. Forwarding to another URL</a></dt>      <a name="getting-data-from-with-LWP-module">  <dt>getting data from with LWP module: <a href="../ch14_05.htm#INDEX-2805">14.5. CGI Gateway to XML Middleware</a></dt>      <a name="image-displayed-for-image-button-specifying">  <dt>image displayed for image button, specifying: <a href="../ch04_02.htm#INDEX-846">4.2.3.8. Image buttons</a></dt>      <a name="invalid-404-status-code-responses-and">  <dt>invalid, 404 status code responses and: <a href="../ch03_03.htm#INDEX-640">3.3.1.3. Specifying status codes</a></dt>      <a name="IP-addresses-problems-with-using-in">  <dt>IP addresses, problems with using in: <a href="../ch02_01.htm#INDEX-189">2.1.1. Elements of a URL</a></dt>      <a name="last-page-visited-by-user-Referer-field">  <dt>last page visited by user (Referer field): <a href="../ch02_03.htm#INDEX-357">2.3.2.7. Referer</a></dt>      <a name="manually-constructed-passing-parameters-without-equal-=-sign">  <dt>manually constructed, passing parameters without equal (=) sign: <a href="../ch04_03.htm#INDEX-914">4.3. Decoding Form Input</a></dt>      <a name="parameters-visibility-in-GET-requests">  <dt>parameters, visibility in GET requests: <a href="../ch08_02.htm#INDEX-1689">8.2.5. Trusting the Browser</a></dt>      <a name="paths">  <dt>paths: <a href="../ch12_03.htm#INDEX-2427">12.3.1. Search Application</a></dt><dd><dl>    <a name="extra-information-maintaining-state-with">    <dt>extra information, maintaining state with: <a href="../ch11_01.htm#INDEX-2179">11.1. Query Strings and Extra Path Information</a></dt>        <a name="mapping-to-CGI-script-directory-on-disk">    <dt>mapping to CGI script directory on disk: <a href="../ch01_04.htm#INDEX-141">1.4.1.1. Configuring by directory</a></dt>        <a name="passing-unique-identifiers-as-extra-information">    <dt>passing unique identifiers as extra information: <a href="../ch11_01.htm#INDEX-2173">11. Maintaining State</a></dt>      </dl></dd>      <a name="query-strings-in">  <dt>query strings in: <a href="../ch02_01.htm#INDEX-199">2.1.1. Elements of a URL</a></dt><dd><dl>    <dt><a href="../ch04_01.htm#INDEX-736">4.1. Sending Data to the Server</a></dt>    <dt><a href="../ch04_03.htm#INDEX-905">4.3. Decoding Form Input</a></dt>    <dt><a href="../ch05_02.htm#INDEX-998">5.2.2.2. POST and the query string</a></dt>  </dl></dd>      <a name="redirection-with-redirect-method">  <dt>redirection with redirect method: <a href="../ch05_03.htm#INDEX-1104">5.3.1.5. Redirection</a></dt>      <a name="related-to-current-looking-up-with-Netscape-browser">  <dt>related to current, looking up with Netscape browser: <a href="../ch14_04.htm#INDEX-2774">14.4. Writing an XML Parser</a></dt>      <a name="relative-advantages-of">  <dt>relative, advantages of: <a href="../ch16_01.htm#INDEX-3072">16.1.3. Use Relative URLs</a></dt>      <a name="of-requested-resources-changed">  <dt>of requested resources, changed: <a href="../ch03_03.htm#INDEX-612">3.3.1.3. Specifying status codes</a></dt><dd><dl>    <dt><a href="../ch03_03.htm#INDEX-619">3.3.1.3. Specifying status codes</a></dt>  </dl></dd>      <a name="specifying-for-tag">  <dt>specifying for tag: <a href="../ch05_03.htm#INDEX-1130">5.3.2.1. start_html</a></dt>      <a name="text-encoding">  <dt>text, encoding: <a href="../ch04_01.htm#INDEX-746">4.1. Sending Data to the Server</a></dt>      <a name="unique-identifier-embedded-in">  <dt>unique identifier embedded in: <a href="../ch11_01.htm#INDEX-2197">11.1. Query Strings and Extra Path Information</a></dt>      <a name="#USERID#-as-identifier-for-documents">  <dt>#USERID# as identifier for documents: <a href="../ch11_01.htm#INDEX-2191">11.1. Query Strings and Extra Path Information</a></dt>  </dl></dd><a name="URNs-Uniform-Resource-Names"><dt>URNs (Uniform Resource Names): <a href="../ch02_01.htm#INDEX-179">2.1. URLs</a></dt><a name="use-statement"><dt>use statement: <a href="../ch10_04.htm#INDEX-2099">10.4.1.1. Connecting to DBI</a></dt><a name="use-strict-command"><dt>use strict command: <a href="../ch01_02.htm#INDEX-42">1.2.1. Sample CGI</a></dt><a name="use-vars-statement"><dt>use vars statement: <a href="../ch10_04.htm#INDEX-2127">10.4.2.2. Address book CGI script</a></dt><a name="user-agent-creating-with-LWP"><dt>user agent, creating with LWP: <a href="../ch14_01.htm#INDEX-2705">14.1.3. LWP</a></dt><a name="User-Agent-field"><dt>User-Agent field: <a href="../ch02_03.htm#INDEX-349">2.3.2.5. User-Agent</a></dt><a name="user-file-user-names-and-encrypted-passwords-in"><dt>user file, user names and encrypted passwords in: <a href="../ch02_03.htm#INDEX-341">2.3.2.4. Authorization</a></dt><a name="user-registration-form-example"><dt>user registration form (example): <a href="../ch07_02.htm#INDEX-1555">7.2.1.3. Validation example</a></dt><a name="user-session"><dt>user session: <a href="../ch11_01.htm#INDEX-2156">11. Maintaining State</a></dt><a name="usernames"><dt>usernames: <a href="../ch02_04.htm#INDEX-425">2.4.2.10. WWW-Authenticate</a></dt><a name="users"><dt>users</dt><dd><dl>    <a name="authentication-and-identification-script">  <dt>authentication and identification (script): <a href="../ch03_04.htm#INDEX-705">3.4.2. User Authentication and Identification</a></dt>      <a name="email-permissions-security-risks-of">  <dt>email permissions, security risks of: <a href="../ch09_01.htm#INDEX-1797">9.1.2. False Identities</a></dt>      <a name="error-information-limiting-view-of">  <dt>error information, limiting view of: <a href="../ch05_05.htm#INDEX-1199">5.5.2. CGI::Carp</a></dt>      <a name="input">  <dt>input</dt><dd><dl>    <a name="tainted-data-checking-for">    <dt>tainted data, checking for: <a href="../ch08_04.htm#INDEX-1731">8.4.1. How Taint Works</a></dt>      </dl></dd>      <a name="input-from">  <dt>input from</dt><dd><dl>    <a name="handling-securely">    <dt>handling securely: <a href="../ch08_02.htm#INDEX-1648">8.2. Handling User Input</a></dt>        <a name="untainting">    <dt>untainting: <a href="../ch08_04.htm#INDEX-1744">8.4.3. How Taintedness Is Removed</a></dt>      </dl></dd>      <a name="tracking">  <dt>tracking: <a href="../ch11_01.htm#INDEX-2153">11. Maintaining State</a></dt>      <a name="web-servers-running-as">  <dt>web servers running as: <a href="../ch09_04.htm#INDEX-1860">9.4.1. 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