github.com/krum110487/go-htaccess@v0.0.0-20240316004156-60641c8e7598/tests/data/apache_2_2_34/manual/howto/htaccess.html.en (about)

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    25              <p> This document refers to a legacy release (<strong>2.2</strong>) of Apache httpd. The active release (<strong>2.4</strong>) is documented <a href="http://httpd.apache.org/docs/current">here</a>. If you have not already upgraded, please follow <a href="http://httpd.apache.org/docs/current/upgrading.html">this link</a> for more information.</p>
    26          <p>You may follow <a href="http://httpd.apache.org/docs/current/howto/htaccess.html">this link</a> to go to the current version of this document.</p></div><div id="preamble"><h1>Apache HTTP Server Tutorial: .htaccess files</h1>
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    33  </div>
    34  
    35  <p><code>.htaccess</code> files provide a way to make configuration
    36  changes on a per-directory basis.</p>
    37  </div>
    38  <div id="quickview"><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#related">.htaccess files</a></li>
    39  <li><img alt="" src="../images/down.gif" /> <a href="#what">What they are/How to use them</a></li>
    40  <li><img alt="" src="../images/down.gif" /> <a href="#when">When (not) to use .htaccess files</a></li>
    41  <li><img alt="" src="../images/down.gif" /> <a href="#how">How directives are applied</a></li>
    42  <li><img alt="" src="../images/down.gif" /> <a href="#auth">Authentication example</a></li>
    43  <li><img alt="" src="../images/down.gif" /> <a href="#ssi">Server Side Includes example</a></li>
    44  <li><img alt="" src="../images/down.gif" /> <a href="#cgi">CGI example</a></li>
    45  <li><img alt="" src="../images/down.gif" /> <a href="#troubleshoot">Troubleshooting</a></li>
    46  </ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
    47  <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
    48  <div class="section">
    49  <h2><a name="related" id="related">.htaccess files</a></h2>
    50      <table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td><ul><li><code class="module"><a href="../mod/core.html">core</a></code></li><li><code class="module"><a href="../mod/mod_authn_file.html">mod_authn_file</a></code></li><li><code class="module"><a href="../mod/mod_authz_groupfile.html">mod_authz_groupfile</a></code></li><li><code class="module"><a href="../mod/mod_cgi.html">mod_cgi</a></code></li><li><code class="module"><a href="../mod/mod_include.html">mod_include</a></code></li><li><code class="module"><a href="../mod/mod_mime.html">mod_mime</a></code></li></ul></td><td><ul><li><code class="directive"><a href="../mod/core.html#accessfilename">AccessFileName</a></code></li><li><code class="directive"><a href="../mod/core.html#allowoverride">AllowOverride</a></code></li><li><code class="directive"><a href="../mod/core.html#options">Options</a></code></li><li><code class="directive"><a href="../mod/mod_mime.html#addhandler">AddHandler</a></code></li><li><code class="directive"><a href="../mod/core.html#sethandler">SetHandler</a></code></li><li><code class="directive"><a href="../mod/core.html#authtype">AuthType</a></code></li><li><code class="directive"><a href="../mod/core.html#authname">AuthName</a></code></li><li><code class="directive"><a href="../mod/mod_authn_file.html#authuserfile">AuthUserFile</a></code></li><li><code class="directive"><a href="../mod/mod_authz_groupfile.html#authgroupfile">AuthGroupFile</a></code></li><li><code class="directive"><a href="../mod/core.html#require">Require</a></code></li></ul></td></tr></table>
    51  
    52      <div class="note">You should avoid using <code>.htaccess</code> files completely if you have access to
    53      httpd main server config file. Using <code>.htaccess</code> files slows down your Apache http server.
    54      Any directive that you can include in a <code>.htaccess</code> file is better set in a <code class="directive"><a href="../mod/core.html#directory">Directory</a></code> block, as it will have the same effect with better performance.</div>
    55  </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
    56  <div class="section">
    57  <h2><a name="what" id="what">What they are/How to use them</a></h2>
    58  
    59  
    60      <p><code>.htaccess</code> files (or "distributed configuration files")
    61      provide a way to make configuration changes on a per-directory basis. A
    62      file, containing one or more configuration directives, is placed in a
    63      particular document directory, and the directives apply to that
    64      directory, and all subdirectories thereof.</p>
    65  
    66      <div class="note"><h3>Note:</h3>
    67        <p>If you want to call your <code>.htaccess</code> file something
    68        else, you can change the name of the file using the <code class="directive"><a href="../mod/core.html#accessfilename">AccessFileName</a></code> directive. For example,
    69        if you would rather call the file <code>.config</code> then you
    70        can put the following in your server configuration file:</p>
    71  
    72        <div class="example"><p><code>
    73          AccessFileName .config
    74        </code></p></div>
    75      </div>
    76  
    77      <p>In general, <code>.htaccess</code> files use the same syntax as
    78      the <a href="../configuring.html#syntax">main configuration
    79      files</a>. What you can put in these files is determined by the
    80      <code class="directive"><a href="../mod/core.html#allowoverride">AllowOverride</a></code> directive. This
    81      directive specifies, in categories, what directives will be
    82      honored if they are found in a <code>.htaccess</code> file. If a
    83      directive is permitted in a <code>.htaccess</code> file, the
    84      documentation for that directive will contain an Override section,
    85      specifying what value must be in <code class="directive"><a href="../mod/core.html#allowoverride">AllowOverride</a></code> in order for that
    86      directive to be permitted.</p>
    87  
    88      <p>For example, if you look at the documentation for the <code class="directive"><a href="../mod/core.html#adddefaultcharset">AddDefaultCharset</a></code>
    89      directive, you will find that it is permitted in <code>.htaccess</code>
    90      files. (See the Context line in the directive summary.) The <a href="../mod/directive-dict.html#Context">Override</a> line reads
    91      <code>FileInfo</code>. Thus, you must have at least
    92      <code>AllowOverride FileInfo</code> in order for this directive to be
    93      honored in <code>.htaccess</code> files.</p>
    94  
    95      <div class="example"><h3>Example:</h3><table>
    96          <tr>
    97            <td><a href="../mod/directive-dict.html#Context">Context:</a></td>
    98            <td>server config, virtual host, directory, .htaccess</td>
    99          </tr>
   100  
   101          <tr>
   102            <td><a href="../mod/directive-dict.html#Override">Override:</a></td>
   103            <td>FileInfo</td>
   104          </tr>
   105        </table></div>
   106  
   107      <p>If you are unsure whether a particular directive is permitted in a
   108      <code>.htaccess</code> file, look at the documentation for that
   109      directive, and check the Context line for ".htaccess".</p>
   110      </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
   111  <div class="section">
   112  <h2><a name="when" id="when">When (not) to use .htaccess files</a></h2>
   113  
   114      <p>In general, you should only use <code>.htaccess</code> files when
   115      you don't have access to the main server configuration file. There is,
   116      for example, a common misconception that user authentication should
   117      always be done in <code>.htaccess</code> files, and, in more recent years,
   118      another misconception that <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> directives
   119      must go in <code>.htaccess</code> files. This is simply not the
   120      case. You can put user authentication configurations in the main server
   121      configuration, and this is, in fact, the preferred way to do
   122      things. Likewise, <code>mod_rewrite</code> directives work better,
   123      in many respects, in the main server configuration.</p>
   124  
   125      <p><code>.htaccess</code> files should be used in a case where the
   126      content providers need to make configuration changes to the server on a
   127      per-directory basis, but do not have root access on the server system.
   128      In the event that the server administrator is not willing to make
   129      frequent configuration changes, it might be desirable to permit
   130      individual users to make these changes in <code>.htaccess</code> files
   131      for themselves. This is particularly true, for example, in cases where
   132      ISPs are hosting multiple user sites on a single machine, and want
   133      their users to be able to alter their configuration.</p>
   134  
   135      <p>However, in general, use of <code>.htaccess</code> files should be
   136      avoided when possible. Any configuration that you would consider
   137      putting in a <code>.htaccess</code> file, can just as effectively be
   138      made in a <code class="directive"><a href="../mod/core.html#directory">&lt;Directory&gt;</a></code> section in your main server
   139      configuration file.</p>
   140  
   141      <p>There are two main reasons to avoid the use of
   142      <code>.htaccess</code> files.</p>
   143  
   144      <p>The first of these is performance. When <code class="directive"><a href="../mod/core.html#allowoverride">AllowOverride</a></code>
   145      is set to allow the use of <code>.htaccess</code> files, httpd will
   146      look in every directory for <code>.htaccess</code> files. Thus,
   147      permitting <code>.htaccess</code> files causes a performance hit,
   148      whether or not you actually even use them! Also, the
   149      <code>.htaccess</code> file is loaded every time a document is
   150      requested.</p>
   151  
   152      <p>Further note that httpd must look for <code>.htaccess</code> files
   153      in all higher-level directories, in order to have a full complement of
   154      directives that it must apply. (See section on <a href="#how">how
   155      directives are applied</a>.) Thus, if a file is requested out of a
   156      directory <code>/www/htdocs/example</code>, httpd must look for the
   157      following files:</p>
   158  
   159      <div class="example"><p><code>
   160        /.htaccess<br />
   161        /www/.htaccess<br />
   162        /www/htdocs/.htaccess<br />
   163        /www/htdocs/example/.htaccess
   164      </code></p></div>
   165  
   166      <p>And so, for each file access out of that directory, there are 4
   167      additional file-system accesses, even if none of those files are
   168      present. (Note that this would only be the case if
   169      <code>.htaccess</code> files were enabled for <code>/</code>, which
   170      is not usually the case.)</p>
   171  
   172      <p>In the case of <code class="directive"><a href="../mod/mod_rewrite.html#rewriterule">RewriteRule</a></code> directives, in
   173      <code>.htaccess</code> context these regular expressions must be
   174      re-compiled with every request to the directory, whereas in main
   175      server configuration context they are compiled once and cached.
   176      Additionally, the rules themselves are more complicated, as one must
   177      work around the restrictions that come with per-directory context
   178      and <code>mod_rewrite</code>. Consult the <a href="../rewrite/intro.html#htaccess">Rewrite Guide</a> for more
   179      detail on this subject.</p>
   180  
   181      <p>The second consideration is one of security. You are permitting
   182      users to modify server configuration, which may result in changes over
   183      which you have no control. Carefully consider whether you want to give
   184      your users this privilege. Note also that giving users less
   185      privileges than they need will lead to additional technical support
   186      requests. Make sure you clearly tell your users what level of
   187      privileges you have given them. Specifying exactly what you have set
   188      <code class="directive"><a href="../mod/core.html#allowoverride">AllowOverride</a></code> to, and pointing them
   189      to the relevant documentation, will save yourself a lot of confusion
   190      later.</p>
   191  
   192      <p>Note that it is completely equivalent to put a <code>.htaccess</code>
   193      file in a directory <code>/www/htdocs/example</code> containing a
   194      directive, and to put that same directive in a Directory section
   195      <code>&lt;Directory /www/htdocs/example&gt;</code> in your main server
   196      configuration:</p>
   197  
   198      <p><code>.htaccess</code> file in <code>/www/htdocs/example</code>:</p>
   199  
   200      <div class="example"><h3>Contents of .htaccess file in
   201      <code>/www/htdocs/example</code></h3><pre class="prettyprint lang-config">AddType text/example .exm</pre>
   202  </div>
   203  
   204      <div class="example"><h3>Section from your <code>httpd.conf</code>
   205      file</h3><p><code>
   206        &lt;Directory /www/htdocs/example&gt;<br />
   207        <span class="indent">
   208          AddType text/example .exm<br />
   209        </span>
   210  &lt;/Directory&gt;
   211      </code></p></div>
   212  
   213      <p>However, putting this configuration in your server configuration
   214      file will result in less of a performance hit, as the configuration is
   215      loaded once when httpd starts, rather than every time a file is
   216      requested.</p>
   217  
   218      <p>The use of <code>.htaccess</code> files can be disabled completely
   219      by setting the <code class="directive"><a href="../mod/core.html#allowoverride">AllowOverride</a></code>
   220      directive to <code>none</code>:</p>
   221  
   222      <div class="example"><p><code>
   223        AllowOverride None
   224      </code></p></div>
   225  </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
   226  <div class="section">
   227  <h2><a name="how" id="how">How directives are applied</a></h2>
   228  
   229      <p>The configuration directives found in a <code>.htaccess</code> file
   230      are applied to the directory in which the <code>.htaccess</code> file
   231      is found, and to all subdirectories thereof. However, it is important
   232      to also remember that there may have been <code>.htaccess</code> files
   233      in directories higher up. Directives are applied in the order that they
   234      are found. Therefore, a <code>.htaccess</code> file in a particular
   235      directory may override directives found in <code>.htaccess</code> files
   236      found higher up in the directory tree. And those, in turn, may have
   237      overridden directives found yet higher up, or in the main server
   238      configuration file itself.</p>
   239  
   240      <p>Example:</p>
   241  
   242      <p>In the directory <code>/www/htdocs/example1</code> we have a
   243      <code>.htaccess</code> file containing the following:</p>
   244  
   245      <div class="example"><p><code>
   246         Options +ExecCGI
   247      </code></p></div>
   248  
   249      <p>(Note: you must have "<code>AllowOverride Options</code>" in effect
   250      to permit the use of the "<code class="directive"><a href="../mod/core.html#options">Options</a></code>" directive in
   251      <code>.htaccess</code> files.)</p>
   252  
   253      <p>In the directory <code>/www/htdocs/example1/example2</code> we have
   254      a <code>.htaccess</code> file containing:</p>
   255  
   256      <div class="example"><p><code>
   257         Options Includes
   258      </code></p></div>
   259  
   260      <p>Because of this second <code>.htaccess</code> file, in the directory
   261      <code>/www/htdocs/example1/example2</code>, CGI execution is not
   262      permitted, as only <code>Options Includes</code> is in effect, which
   263      completely overrides any earlier setting that may have been in
   264      place.</p>
   265  
   266      <h3><a name="merge" id="merge">Merging of .htaccess with the main
   267      configuration files</a></h3>
   268  
   269      <p>As discussed in the documentation on <a href="../sections.html">Configuration Sections</a>,
   270      <code>.htaccess</code> files can override the <code class="directive"><a href="../mod/core.html#directory">&lt;Directory&gt;</a></code> sections for
   271      the corresponding directory, but will be overridden by other types
   272      of configuration sections from the main configuration files. This
   273      fact can be used to enforce certain configurations, even in the
   274      presence of a liberal <code class="directive"><a href="../mod/core.html#allowoverride">AllowOverride</a></code> setting. For example, to
   275      prevent script execution while allowing anything else to be set in
   276      <code>.htaccess</code> you can use:</p>
   277  
   278      <div class="example"><p><code>
   279  &lt;Directory /&gt;<br />
   280  <span class="indent">
   281  Allowoverride All<br />
   282  </span>
   283  &lt;/Directory&gt;<br />
   284  <br />
   285  &lt;Location /&gt;<br />
   286  <span class="indent">
   287      Options +IncludesNoExec -ExecCGI<br />
   288  </span>
   289  &lt;/Location&gt;
   290      </code></p></div>
   291  
   292  
   293  </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
   294  <div class="section">
   295  <h2><a name="auth" id="auth">Authentication example</a></h2>
   296  
   297      <p>If you jumped directly to this part of the document to find out how
   298      to do authentication, it is important to note one thing. There is a
   299      common misconception that you are required to use
   300      <code>.htaccess</code> files in order to implement password
   301      authentication. This is not the case. Putting authentication directives
   302      in a <code class="directive"><a href="../mod/core.html#directory">&lt;Directory&gt;</a></code>
   303      section, in your main server configuration file, is the preferred way
   304      to implement this, and <code>.htaccess</code> files should be used only
   305      if you don't have access to the main server configuration file. See <a href="#when">above</a> for a discussion of when you should and should
   306      not use <code>.htaccess</code> files.</p>
   307  
   308      <p>Having said that, if you still think you need to use a
   309      <code>.htaccess</code> file, you may find that a configuration such as
   310      what follows may work for you.</p>
   311  
   312      <p><code>.htaccess</code> file contents:</p>
   313  
   314      <div class="example"><p><code>
   315        AuthType Basic<br />
   316        AuthName "Password Required"<br />
   317        AuthUserFile /www/passwords/password.file<br />
   318        AuthGroupFile /www/passwords/group.file<br />
   319  Require Group admins
   320      </code></p></div>
   321  
   322      <p>Note that <code>AllowOverride AuthConfig</code> must be in effect
   323      for these directives to have any effect.</p>
   324  
   325      <p>Please see the <a href="auth.html">authentication tutorial</a> for a
   326      more complete discussion of authentication and authorization.</p>
   327  </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
   328  <div class="section">
   329  <h2><a name="ssi" id="ssi">Server Side Includes example</a></h2>
   330  
   331      <p>Another common use of <code>.htaccess</code> files is to enable
   332      Server Side Includes for a particular directory. This may be done with
   333      the following configuration directives, placed in a
   334      <code>.htaccess</code> file in the desired directory:</p>
   335  
   336      <div class="example"><p><code>
   337         Options +Includes<br />
   338         AddType text/html shtml<br />
   339  AddHandler server-parsed shtml
   340      </code></p></div>
   341  
   342      <p>Note that <code>AllowOverride Options</code> and <code>AllowOverride
   343      FileInfo</code> must both be in effect for these directives to have any
   344      effect.</p>
   345  
   346      <p>Please see the <a href="ssi.html">SSI tutorial</a> for a more
   347      complete discussion of server-side includes.</p>
   348  </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
   349  <div class="section">
   350  <h2><a name="cgi" id="cgi">CGI example</a></h2>
   351  
   352      <p>Finally, you may wish to use a <code>.htaccess</code> file to permit
   353      the execution of CGI programs in a particular directory. This may be
   354      implemented with the following configuration:</p>
   355  
   356      <div class="example"><p><code>
   357         Options +ExecCGI<br />
   358  AddHandler cgi-script cgi pl
   359      </code></p></div>
   360  
   361      <p>Alternately, if you wish to have all files in the given directory be
   362      considered to be CGI programs, this may be done with the following
   363      configuration:</p>
   364  
   365      <div class="example"><p><code>
   366         Options +ExecCGI<br />
   367  SetHandler cgi-script
   368      </code></p></div>
   369  
   370      <p>Note that <code>AllowOverride Options</code> and <code>AllowOverride
   371      FileInfo</code> must both be in effect for these directives to have any
   372      effect.</p>
   373  
   374      <p>Please see the <a href="cgi.html">CGI tutorial</a> for a more
   375      complete discussion of CGI programming and configuration.</p>
   376  
   377  </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
   378  <div class="section">
   379  <h2><a name="troubleshoot" id="troubleshoot">Troubleshooting</a></h2>
   380  
   381      <p>When you put configuration directives in a <code>.htaccess</code>
   382      file, and you don't get the desired effect, there are a number of
   383      things that may be going wrong.</p>
   384  
   385      <p>Most commonly, the problem is that <code class="directive"><a href="../mod/core.html#allowoverride">AllowOverride</a></code> is not
   386      set such that your configuration directives are being honored. Make
   387      sure that you don't have a <code>AllowOverride None</code> in effect
   388      for the file scope in question. A good test for this is to put garbage
   389      in your <code>.htaccess</code> file and reload the page. If a server error is
   390      not generated, then you almost certainly have <code>AllowOverride
   391      None</code> in effect.</p>
   392  
   393      <p>If, on the other hand, you are getting server errors when trying to
   394      access documents, check your httpd error log. It will likely tell you
   395      that the directive used in your <code>.htaccess</code> file is not
   396      permitted.</p>
   397  
   398      <div class="example"><p><code>
   399      [Fri Sep 17 18:43:16 2010] [alert] [client 192.168.200.51] /var/www/html/.htaccess: DirectoryIndex not allowed here
   400      </code></p></div>
   401  
   402      <p>This will indicate either that you've used a directive that is
   403      never permitted in <code>.htaccess</code> files, or that you simply
   404      don't have <code class="directive"><a href="../mod/core.html#allowoverride">AllowOverride</a></code> set to
   405      a level sufficient for the directive you've used. Consult the
   406      documentation for that particular directive to determine which is
   407      the case.</p>
   408  
   409      <p>Alternately, it may tell you that you had a syntax error in your
   410      usage of the directive itself.</p>
   411  
   412      <div class="example"><p><code>
   413      [Sat Aug 09 16:22:34 2008] [alert] [client 192.168.200.51] /var/www/html/.htaccess: RewriteCond: bad flag delimiters
   414      </code></p></div>
   415  
   416      <p>In this case, the error message should be specific to the
   417      particular syntax error that you have committed.</p>
   418  
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