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+nghttp2_set_debug_vprintf_callback
+==================================
+
+Synopsis
+--------
+
+*#include <nghttp2/nghttp2.h>*
+
+.. function:: void nghttp2_set_debug_vprintf_callback( nghttp2_debug_vprintf_callback debug_vprintf_callback)
+
+    
+    Sets a debug output callback called by the library when built with
+    ``DEBUGBUILD`` macro defined.  If this option is not used, debug
+    log is written into standard error output.
+    
+    For builds without ``DEBUGBUILD`` macro defined, this function is
+    noop.
+    
+    Note that building with ``DEBUGBUILD`` may cause significant
+    performance penalty to libnghttp2 because of extra processing.  It
+    should be used for debugging purpose only.
+    
+    .. Warning::
+    
+      Building with ``DEBUGBUILD`` may cause significant performance
+      penalty to libnghttp2 because of extra processing.  It should be
+      used for debugging purpose only.  We write this two times because
+      this is important.