FreeBSD has migrated to Bugzilla.

src/os/unix/ngx_darwin_sendfile_chain.c

diff --git a/src/os/unix/ngx_darwin_sendfile_chain.c b/src/os/unix/ngx_darwin_sendfile_chain.c
index 76c4a3a..ee44e1d 100644
--- a/src/os/unix/ngx_darwin_sendfile_chain.c
+++ b/src/os/unix/ngx_darwin_sendfile_chain.c
@@ -13,7 +13,7 @@
 /*
  * It seems that Darwin 9.4 (Mac OS X 1.5) sendfile() has the same
  * old bug as early FreeBSD sendfile() syscall:
- * http://www.freebsd.org/cgi/query-pr.cgi?pr=33771
+ * http://bugs.freebsd.org/33771
  *
  * Besides sendfile() has another bug: if one calls sendfile()
  * with both a header and a trailer, then sendfile() ignores a file part

src/os/unix/ngx_freebsd_sendfile_chain.c

diff --git a/src/os/unix/ngx_freebsd_sendfile_chain.c b/src/os/unix/ngx_freebsd_sendfile_chain.c
index 11cec82..6491e92 100644
--- a/src/os/unix/ngx_freebsd_sendfile_chain.c
+++ b/src/os/unix/ngx_freebsd_sendfile_chain.c
@@ -265,7 +265,7 @@
 
             /*
              * the "nbytes bug" of the old sendfile() syscall:
-             * http://www.freebsd.org/cgi/query-pr.cgi?pr=33771
+             * http://bugs.freebsd.org/33771
              */
 
             if (!ngx_freebsd_sendfile_nbytes_bug) {