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copied!<p>I ran into an almost identical problem just now. I'm using a module that someone else wrote. On one test machine the module was doing authN and authZ correctly. On a different machine <code>r->filename</code> was <code>NULL</code> inside of the auth checker hook. Your question here came up first in my google search.</p> <p>In my case I tracked it down to an incorrect usage of <code>ap_set_module_config</code>. The code looked like:</p> <pre><code>ap_set_module_config(r, &auth_my_module, attrs); </code></pre> <p>The source code for <code>ap_set_module_config</code> says this:</p> <pre><code>/** * Generic accessors for other modules to set at their own module-specific * data * @param conf_vector The vector in which the modules configuration is stored. * usually r->per_dir_config or s->module_config * @param m The module to set the data for. * @param val The module-specific data to set */ AP_DECLARE(void) ap_set_module_config(ap_conf_vector_t *cv, const module *m, void *val); </code></pre> <p>I changed the the call to <code>ap_set_module_config</code> to this:</p> <pre><code>ap_set_module_config(r->per_dir_config, &auth_my_module, attrs); </code></pre> <p>And just like magic, <code>r->filename</code> is no longer <code>NULL</code> in the auth checker hook. I'm new to writing apache modules so I need to find out exactly what this means, but I'm glad I figured out where the problem is. You might check your code to see how you call <code>ap_set_module_config</code>.</p> <p><strong>Edit:</strong> I should add that I tracked this down by adding debug statements that showed me exactly when the <code>filename</code> field of the <code>request_rec</code> struct became <code>NULL</code>. For me it went from valid to <code>NULL</code> inside a hook I defined.</p> <p>Good luck!</p>

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