1.10.33.6 -> 1.10.33.7

Fixes https://github.com/pagespeed/ngx_pagespeed/issues/1138

config

@@ -29,8 +29,8 @@ if [ "$mod_pagespeed_dir" = "unset" ] ; then
     echo "   You need to separately download the pagespeed library:"
     echo ""
     echo "     $ cd /path/to/ngx_pagespeed"
-    echo "     $ wget https://dl.google.com/dl/page-speed/psol/1.9.32.1.tar.gz"
-    echo "     $ tar -xzvf 1.9.32.1.tar.gz # expands to psol/"
+    echo "     $ wget https://dl.google.com/dl/page-speed/psol/1.10.33.7.tar.gz"
+    echo "     $ tar -xzvf 1.10.33.7.tar.gz # expands to psol/"
     echo ""
     echo "   Or see the installation instructions:"
     echo "     https://github.com/pagespeed/ngx_pagespeed#how-to-build"
@@ -118,6 +118,13 @@ case "$NGX_GCC_VER" in
   ;;
 esac
 
+# workaround for a bug in nginx-1.9.11, see:
+# http://hg.nginx.org/nginx/rev/ff1e625ae55b
+NGX_VERSION=`grep nginx_version src/core/nginx.h | sed -e 's/^.* \(.*\)$/\1/'`
+if [ "$NGX_VERSION" = "1009011" ]; then
+    CFLAGS="$CFLAGS -Wno-write-strings"
+fi
+
 if [ "$WNO_ERROR" = "YES" ]; then
     CFLAGS="$CFLAGS -Wno-error"
 fi
@@ -186,65 +193,7 @@ ngx_feature_test="
 # Test whether we have pagespeed and can compile and link against it.
 . "$ngx_addon_dir/cpp_feature"
 
-if [ $ngx_found = yes ]; then
-  ps_src="$ngx_addon_dir/src"
-  ngx_addon_name=ngx_pagespeed
-  NGX_ADDON_DEPS="$NGX_ADDON_DEPS \
-    $ps_src/log_message_handler.h \
-    $ps_src/ngx_base_fetch.h \
-    $ps_src/ngx_caching_headers.h \
-    $ps_src/ngx_event_connection.h \
-    $ps_src/ngx_fetch.h \
-    $ps_src/ngx_gzip_setter.h \
-    $ps_src/ngx_list_iterator.h \
-    $ps_src/ngx_message_handler.h \
-    $ps_src/ngx_pagespeed.h \
-    $ps_src/ngx_rewrite_driver_factory.h \
-    $ps_src/ngx_rewrite_options.h \
-    $ps_src/ngx_server_context.h \
-    $ps_src/ngx_url_async_fetcher.h \
-    $psol_binary"
-  NGX_ADDON_SRCS="$NGX_ADDON_SRCS \
-    $ps_src/log_message_handler.cc \
-    $ps_src/ngx_base_fetch.cc \
-    $ps_src/ngx_caching_headers.cc \
-    $ps_src/ngx_event_connection.cc \
-    $ps_src/ngx_fetch.cc \
-    $ps_src/ngx_gzip_setter.cc \
-    $ps_src/ngx_list_iterator.cc \
-    $ps_src/ngx_message_handler.cc \
-    $ps_src/ngx_pagespeed.cc \
-    $ps_src/ngx_rewrite_driver_factory.cc \
-    $ps_src/ngx_rewrite_options.cc \
-    $ps_src/ngx_server_context.cc \
-    $ps_src/ngx_url_async_fetcher.cc"
-  # Save our sources in a separate var since we may need it in config.make
-  PS_NGX_SRCS="$NGX_ADDON_SRCS"
-
-  if [ "$position_aux" = "true" ] ; then
-     HTTP_AUX_FILTER_MODULES="$HTTP_AUX_FILTER_MODULES $ngx_addon_name"
-  else
-    # Make pagespeed run immediately before gzip and Brotli.
-    if echo $HTTP_FILTER_MODULES | grep ngx_http_brotli_filter_module >/dev/null; then
-      module=ngx_http_brotli_filter_module
-    elif [ $HTTP_GZIP = YES ]; then
-      module=$HTTP_GZIP_FILTER_MODULE
-    else
-      module=$HTTP_RANGE_HEADER_FILTER_MODULE
-    fi
-
-    HTTP_FILTER_MODULES=$(echo $HTTP_FILTER_MODULES |\
-      sed "s/$module/$module $ngx_addon_name/")
-  fi
-
-  # Make the etag header filter run immediately before range header filter.
-  HTTP_FILTER_MODULES=$(echo $HTTP_FILTER_MODULES |\
-    sed "s/$HTTP_RANGE_HEADER_FILTER_MODULE/$HTTP_RANGE_HEADER_FILTER_MODULE ngx_pagespeed_etag_filter/")
-
-  CORE_LIBS="$CORE_LIBS $pagespeed_libs"
-  CORE_INCS="$CORE_INCS $pagespeed_include"
-  echo "List of modules (in reverse order of applicability): "$HTTP_FILTER_MODULES
-else
+if [ $ngx_found = no ]; then
   cat << END
 $0: error: module ngx_pagespeed requires the pagespeed optimization library.
 Look in obj/autoconf.err for more details.
@@ -252,6 +201,115 @@ END
   exit 1
 fi
 
+ps_src="$ngx_addon_dir/src"
+ngx_addon_name=ngx_pagespeed
+NGX_ADDON_DEPS="$NGX_ADDON_DEPS \
+$ps_src/log_message_handler.h \
+$ps_src/ngx_base_fetch.h \
+$ps_src/ngx_caching_headers.h \
+$ps_src/ngx_event_connection.h \
+$ps_src/ngx_fetch.h \
+$ps_src/ngx_gzip_setter.h \
+$ps_src/ngx_list_iterator.h \
+$ps_src/ngx_message_handler.h \
+$ps_src/ngx_pagespeed.h \
+$ps_src/ngx_rewrite_driver_factory.h \
+$ps_src/ngx_rewrite_options.h \
+$ps_src/ngx_server_context.h \
+$ps_src/ngx_url_async_fetcher.h \
+$psol_binary"
+NPS_SRCS=" \
+$ps_src/log_message_handler.cc \
+$ps_src/ngx_base_fetch.cc \
+$ps_src/ngx_caching_headers.cc \
+$ps_src/ngx_event_connection.cc \
+$ps_src/ngx_fetch.cc \
+$ps_src/ngx_gzip_setter.cc \
+$ps_src/ngx_list_iterator.cc \
+$ps_src/ngx_message_handler.cc \
+$ps_src/ngx_pagespeed.cc \
+$ps_src/ngx_rewrite_driver_factory.cc \
+$ps_src/ngx_rewrite_options.cc \
+$ps_src/ngx_server_context.cc \
+$ps_src/ngx_url_async_fetcher.cc"
+# Save our sources in a separate var since we may need it in config.make
+PS_NGX_SRCS="$NGX_ADDON_SRCS \
+$NPS_SRCS"
+
+# Make pagespeed run immediately before gzip and Brotli.
+if echo $HTTP_FILTER_MODULES | grep ngx_http_brotli_filter_module >/dev/null; then
+  next=ngx_http_brotli_filter_module
+elif [ $HTTP_GZIP = YES ]; then
+  next=ngx_http_gzip_filter_module
+else
+  next=ngx_http_range_header_filter_module
+fi
+
+if [ -n "$ngx_module_link" ]; then
+  # nginx-1.9.11+
+  ngx_module_type=HTTP_FILTER
+  ngx_module_name="ngx_pagespeed ngx_pagespeed_etag_filter"
+  ngx_module_incs="$ngx_feature_path"
+  ngx_module_deps=
+  ngx_module_srcs="$NPS_SRCS"
+  ngx_module_libs="$ngx_feature_libs"
+  ngx_module_order="ngx_http_range_header_filter_module\
+                    ngx_pagespeed_etag_filter\
+                    ngx_http_gzip_filter_module \
+                    ngx_http_brotli_filter_module \
+                    ngx_pagespeed \
+                    ngx_http_postpone_filter_module \
+                    ngx_http_ssi_filter_module \
+                    ngx_http_charset_filter_module \
+                    ngx_http_xslt_filter_module \
+                    ngx_http_image_filter_module \
+                    ngx_http_sub_filter_module \
+                    ngx_http_addition_filter_module \
+                    ngx_http_gunzip_filter_module \
+                    ngx_http_userid_filter_module \
+                    ngx_http_headers_filter_module"
+
+    . auto/module
+
+    if [ $ngx_module_link != DYNAMIC ]; then
+      # ngx_module_order doesn't work with static modules,
+      # so we must re-order filters here.
+      if [ "$position_aux" = "true" ] ; then
+        HTTP_AUX_FILTER_MODULES="$HTTP_AUX_FILTER_MODULES $ngx_addon_name"
+      else
+        HTTP_FILTER_MODULES=$(echo $HTTP_FILTER_MODULES \
+                             | sed "s/ngx_pagespeed//" \
+                             | sed "s/$next/$next ngx_pagespeed/")
+      fi
+      # Make the etag header filter run immediately before range header filter.
+      HTTP_FILTER_MODULES=$(echo $HTTP_FILTER_MODULES \
+                           | sed "s/ngx_pagespeed_etag_filter//" \
+                           | sed "s/ngx_http_range_header_filter_module/ngx_http_range_header_filter_module ngx_pagespeed_etag_filter/")
+    else
+      # config.make is not executed for dynamic modules
+      CFLAGS="$CFLAGS -Wno-c++11-extensions"
+      if [ "$position_aux" = "true" ] ; then
+        ngx_module_type=HTTP_AUX_FILTER
+        ngx_module_order=""
+      fi
+    fi
+else
+  CORE_LIBS="$CORE_LIBS $pagespeed_libs"
+  CORE_INCS="$CORE_INCS $pagespeed_include"
+  NGX_ADDON_SRCS="$PS_NGX_SRCS"
+  if [ "$position_aux" = "true" ] ; then
+    HTTP_AUX_FILTER_MODULES="$HTTP_AUX_FILTER_MODULES $ngx_addon_name"
+  else
+    HTTP_FILTER_MODULES=$(echo $HTTP_FILTER_MODULES | sed "s/$next/$next $ngx_addon_name/")
+  fi
+
+  # Make the etag header filter run immediately before range header filter.
+  HTTP_FILTER_MODULES=$(echo $HTTP_FILTER_MODULES |\
+    sed "s/ngx_http_range_header_filter_module/ngx_http_range_header_filter_module ngx_pagespeed_etag_filter/")
+fi
+
+echo "List of modules (in reverse order of applicability): "$HTTP_FILTER_MODULES
+
 # Test whether the compiler is compatible
 ngx_feature="psol-compiler-compat"
 ngx_feature_name=""

src/ngx_base_fetch.cc

@@ -118,6 +118,8 @@ const char* BaseFetchTypeToCStr(NgxBaseFetchType type) {
   return "can't get here";
 }
 
+// TODO(oschaaf): replace the ngx_log_error with VLOGS or pass in a
+// MessageHandler and use that.
 void NgxBaseFetch::ReadCallback(const ps_event_data& data) {
   NgxBaseFetch* base_fetch = reinterpret_cast<NgxBaseFetch*>(data.sender);
   ngx_http_request_t* r = base_fetch->request();
@@ -138,19 +140,40 @@ void NgxBaseFetch::ReadCallback(const ps_event_data& data) {
   if (refcount == 0 || detached) {
     return;
   }
+
   ps_request_ctx_t* ctx = ps_get_request_context(r);
 
-  CHECK(data.sender == ctx->base_fetch);
-  CHECK(r->count > 0) << "r->count: " << r->count;
+  // If our request context was zeroed, skip this event.
+  // See https://github.com/pagespeed/ngx_pagespeed/issues/1081
+  if (ctx == NULL) {
+    // Should not happen normally, when it does this message will cause our
+    // system tests to fail.
+    ngx_log_error(NGX_LOG_WARN, ngx_cycle->log, 0,
+        "pagespeed [%p] skipping event: request context gone", r);
+    return;
+  }
+
+  // Normally we expect the sender to equal the active NgxBaseFetch instance.
+  DCHECK(data.sender == ctx->base_fetch);
+
+  // If someone changed our request context or NgxBaseFetch, skip processing.
+  if (data.sender != ctx->base_fetch) {
+      ngx_log_error(NGX_LOG_WARN, ngx_cycle->log, 0,
+          "pagespeed [%p] skipping event: event originating from disassociated"
+          " NgxBaseFetch instance.", r);
+      return;
+  }
 
   int rc;
+  bool run_posted = true;
   // If we are unlucky enough to have our connection finalized mid-ipro-lookup,
   // we must enter a different flow. Also see ps_in_place_check_header_filter().
   if ((ctx->base_fetch->base_fetch_type_ != kIproLookup)
       && r->connection->error) {
     ngx_log_error(NGX_LOG_DEBUG, ngx_cycle->log, 0,
-      "pagespeed [%p] request already finalized", r);
+      "pagespeed [%p] request already finalized %d", r, r->count);
     rc = NGX_ERROR;
+    run_posted = false;
   } else {
     rc = ps_base_fetch::ps_base_fetch_handler(r);
   }
@@ -163,8 +186,11 @@ void NgxBaseFetch::ReadCallback(const ps_event_data& data) {
 
   ngx_connection_t* c = r->connection;
   ngx_http_finalize_request(r, rc);
-  // See http://forum.nginx.org/read.php?2,253006,253061
-  ngx_http_run_posted_requests(c);
+
+  if (run_posted) {
+    // See http://forum.nginx.org/read.php?2,253006,253061
+    ngx_http_run_posted_requests(c);
+  }
 }
 
 void NgxBaseFetch::Lock() {

src/ngx_pagespeed.cc

@@ -284,7 +284,8 @@ ngx_int_t ps_base_fetch_handler(ngx_http_request_t* r) {
     // modules running after us to manipulate those responses.
     if (!status_ok && (ctx->base_fetch->base_fetch_type() != kHtmlTransform
                        && ctx->base_fetch->base_fetch_type() != kIproLookup)) {
-      return status_code;
+      ps_release_base_fetch(ctx);
+      return ngx_http_filter_finalize_request(r, NULL, status_code);
     }
 
     if (ctx->preserve_caching_headers != kDontPreserveHeaders) {
@@ -302,6 +303,12 @@ ngx_int_t ps_base_fetch_handler(ngx_http_request_t* r) {
                 STR_CASE_EQ_LITERAL(header->key, "Last-Modified") ||
                 STR_CASE_EQ_LITERAL(header->key, "Expires"))))) {
           header->hash = 0;
+          if (STR_CASE_EQ_LITERAL(header->key, "Location")) {
+            // There's a possible issue with the location header, where setting
+            // the hash to 0 is not enough. See:
+            // https://github.com/nginx/nginx/blob/master/src/http/ngx_http_header_filter_module.c#L314
+            r->headers_out.location = NULL;
+          }
         }
       }
     } else {
@@ -452,11 +459,6 @@ void copy_response_headers_from_ngx(const ngx_http_request_t* r,
 
   headers->set_status_code(r->headers_out.status);
 
-  if (r->headers_out.location != NULL) {
-    headers->Add(HttpAttributes::kLocation,
-                 str_to_string_piece(r->headers_out.location->value));
-  }
-
   // Manually copy over the content type because it's not included in
   // request_->headers_out.headers.
   headers->Add(HttpAttributes::kContentType,
@@ -490,6 +492,10 @@ ngx_int_t copy_response_headers_to_ngx(
 
   ngx_int_t i;
   for (i = 0 ; i < pagespeed_headers.NumAttributes() ; i++) {
+    // For IPRO cache misses, these gs_ variables may point to freed memory
+    // when nginx writes the headers to the output as the NgxBaseFetch instance
+    // that owns this memory gets released during request processing. So we
+    // copy these strings later on.
     const GoogleString& name_gs = pagespeed_headers.Name(i);
     const GoogleString& value_gs = pagespeed_headers.Value(i);
 
@@ -510,6 +516,9 @@ ngx_int_t copy_response_headers_to_ngx(
     }  // else we don't preserve any headers.
 
     ngx_str_t name, value;
+    value.len = value_gs.size();
+    value.data = reinterpret_cast<u_char*>(
+        string_piece_to_pool_string(r->pool, value_gs.c_str()));
 
     // To prevent the gzip module from clearing weak etags, we output them
     // using a different name here. The etag header filter module runs behind
@@ -520,11 +529,15 @@ ngx_int_t copy_response_headers_to_ngx(
       name.data = reinterpret_cast<u_char*>(
           const_cast<char*>(kInternalEtagName));
     } else {
-      name.len = name_gs.length();
-      name.data = reinterpret_cast<u_char*>(const_cast<char*>(name_gs.data()));
+      name.len = name_gs.size();
+      name.data = reinterpret_cast<u_char*>(
+          string_piece_to_pool_string(r->pool, name_gs.c_str()));
+    }
+
+    // In case string_piece_to_pool_string failed:
+    if (name.data == NULL || value.data == NULL) {
+        return NGX_ERROR;
     }
-    value.len = value_gs.length();
-    value.data = reinterpret_cast<u_char*>(const_cast<char*>(value_gs.data()));
 
     // TODO(jefftk): If we're setting a cache control header we'd like to
     // prevent any downstream code from changing it.  Specifically, if we're
@@ -535,24 +548,17 @@ ngx_int_t copy_response_headers_to_ngx(
     // net/instaweb/apache/header_util:AddResponseHeadersToRequest
 
     // Make copies of name and value to put into headers_out.
-
-    u_char* value_s = ngx_pstrdup(r->pool, &value);
-    if (value_s == NULL) {
-      return NGX_ERROR;
-    }
-
     if (STR_EQ_LITERAL(name, "Cache-Control")) {
-      ps_set_cache_control(r, const_cast<char*>(value_gs.c_str()));
+      ps_set_cache_control(r, reinterpret_cast<char*>(value.data));
       continue;
     } else if (STR_EQ_LITERAL(name, "Content-Type")) {
       // Unlike all the other headers, content_type is just a string.
-      headers_out->content_type.data = value_s;
-      headers_out->content_type.len = value.len;
+      headers_out->content_type = value;
 
       // We should not include the charset when determining content_type_len, so
       // scan for the ';' that marks the start of the charset part.
       for (ngx_uint_t i = 0; i < value.len; i++) {
-        if (value_s[i] == ';') {
+        if (value.data[i] == ';') {
           break;
         }
         headers_out->content_type_len = i + 1;
@@ -572,11 +578,6 @@ ngx_int_t copy_response_headers_to_ngx(
       continue;
     }
 
-    u_char* name_s = ngx_pstrdup(r->pool, &name);
-    if (name_s == NULL) {
-      return NGX_ERROR;
-    }
-
     ngx_table_elt_t* header = static_cast<ngx_table_elt_t*>(
         ngx_list_push(&headers_out->headers));
     if (header == NULL) {
@@ -584,10 +585,10 @@ ngx_int_t copy_response_headers_to_ngx(
     }
 
     header->hash = 1;  // Include this header in the output.
+    header->key.data = name.data;
     header->key.len = name.len;
-    header->key.data = name_s;
+    header->value.data = value.data;
     header->value.len = value.len;
-    header->value.data = value_s;
 
     // Populate the shortcuts to commonly used headers.
     if (STR_EQ_LITERAL(name, "Date")) {
@@ -636,7 +637,7 @@ typedef struct {
 typedef struct {
   // If pagespeed is configured in some server block but not this one our
   // per-request code will be invoked but server context will be null.  In those
-  // cases we neet to short circuit, not changing anything.  Currently our
+  // cases we need to short circuit, not changing anything.  Currently our
   // header filter, body filter, and content handler all do this, but if anyone
   // adds another way for nginx to give us a request to process we need to check
   // there as well.
@@ -986,6 +987,7 @@ void* ps_create_main_conf(ngx_conf_t* cf) {
       "" /* hostname, not used */,
       -1 /* port, not used */);
   active_driver_factory = cfg_m->driver_factory;
+  active_driver_factory->LoggingInit(ngx_cycle->log, false);
   cfg_m->driver_factory->Init();
   ps_set_conf_cleanup_handler(cf, ps_cleanup_main_conf, cfg_m);
   return cfg_m;
@@ -2478,8 +2480,8 @@ ngx_int_t send_out_headers_and_body(
 
   rc = ngx_http_send_header(r);
 
-  if (rc != NGX_OK) {
-    return NGX_ERROR;
+  if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
+    return rc;
   }
 
   // Send the body.
@@ -3051,7 +3053,7 @@ ngx_int_t ps_init_module(ngx_cycle_t* cycle) {
       return NGX_ERROR;
     }
 
-    cfg_m->driver_factory->LoggingInit(cycle->log);
+    cfg_m->driver_factory->LoggingInit(cycle->log, true);
     cfg_m->driver_factory->RootInit();
   } else {
     delete cfg_m->driver_factory;
@@ -3065,7 +3067,9 @@ void ps_exit_child_process(ngx_cycle_t* cycle) {
   ps_main_conf_t* cfg_m = static_cast<ps_main_conf_t*>(
       ngx_http_cycle_get_module_main_conf(cycle, ngx_pagespeed));
   NgxBaseFetch::Terminate();
-  cfg_m->driver_factory->ShutDown();
+  if (cfg_m->driver_factory != NULL) {
+    cfg_m->driver_factory->ShutDown();
+  }
 }
 
 // Called when nginx forks worker processes.  No threads should be started
@@ -3083,7 +3087,7 @@ ngx_int_t ps_init_child_process(ngx_cycle_t* cycle) {
 
   // ChildInit() will initialise all ServerContexts, which we need to
   // create ProxyFetchFactories below
-  cfg_m->driver_factory->LoggingInit(cycle->log);
+  cfg_m->driver_factory->LoggingInit(cycle->log, true);
   cfg_m->driver_factory->ChildInit();
 
   ngx_http_core_main_conf_t* cmcf = static_cast<ngx_http_core_main_conf_t*>(

src/ngx_rewrite_driver_factory.cc

@@ -208,10 +208,11 @@ void NgxRewriteDriverFactory::StartThreads() {
   threads_started_ = true;
 }
 
-void NgxRewriteDriverFactory::LoggingInit(ngx_log_t* log) {
+void NgxRewriteDriverFactory::LoggingInit(
+    ngx_log_t* log, bool may_install_crash_handler) {
   log_ = log;
   net_instaweb::log_message_handler::Install(log);
-  if (install_crash_handler()) {
+  if (may_install_crash_handler && install_crash_handler()) {
     NgxMessageHandler::InstallCrashHandler(log);
   }
   ngx_message_handler_->set_log(log);

src/ngx_rewrite_driver_factory.h

@@ -115,7 +115,7 @@ class NgxRewriteDriverFactory : public SystemRewriteDriverFactory {
     return process_script_variables_;
   }
 
-  void LoggingInit(ngx_log_t* log);
+  void LoggingInit(ngx_log_t* log, bool may_install_crash_handler);
 
   virtual void ShutDownMessageHandlers();
 

test/nginx_system_test.sh

@@ -552,7 +552,7 @@ fetch_until "$URL" "fgrep -c .pagespeed." 1 --header=Host:www.google.com
 
 # If this accepts the Host header and fetches from google.com it will fail with
 # a 404.  Instead it should use a loopback fetch and succeed.
-URL="$HOSTNAME/mod_pagespeed_example/.pagespeed.ce.8CfGBvwDhH.css"
+URL="$HOSTNAME/mod_pagespeed_example/styles/big.css.pagespeed.ce.8CfGBvwDhH.css"
 check wget -O /dev/null --header=Host:www.google.com "$URL"
 
 start_test statistics load
@@ -1241,6 +1241,14 @@ check_from "$OUT" fgrep -qi '404'
 MATCHES=$(echo "$OUT" | grep -c "Cache-Control: override") || true
 check [ $MATCHES -eq 1 ]
 
+start_test Custom 404 does not crash.
+URL=http://custom404.example.com/mod_pagespeed_test/
+URL+=A.doesnotexist.css.pagespeed.cf.0.css
+# The 404 response makes wget exit with an error code, which we ignore.
+OUT=$(http_proxy=$SECONDARY_HOSTNAME $WGET_DUMP -O /dev/null -S $URL 2>&1) || true
+# We ignored the exit code, check if we got a 404 response.
+check_from "$OUT" fgrep -qi '404'
+
 start_test Shutting down.
 
 # Fire up some heavy load if ab is available to test a stressed shutdown
@@ -1316,6 +1324,8 @@ OUT=$(cat "$ERROR_LOG" \
     | grep -v "\\[warn\\].*remote\.cfg.*" \
     | grep -v "\\[warn\\].*end token not received.*" \
     | grep -v "\\[warn\\].*failed to hook next event.*" \
+    | grep -v "\\[warn\\].*Rewrite.*failed.*.pagespeed....0.foo.*" \
+    | grep -v "\\[warn\\].*A.blue.css.*but cannot access the original.*" \
     || true)
 
 check [ -z "$OUT" ]

test/pagespeed_test.conf.template

@@ -967,6 +967,14 @@ http {
     }
   }
 
+  server {
+    listen @@SECONDARY_PORT@@;
+    listen [::]:@@SECONDARY_PORT@@;
+    server_name custom404.example.com;
+    pagespeed FileCachePath "@@SECONDARY_CACHE@@";
+    error_page 404 /404.html;
+  }
+
   server {
     listen @@SECONDARY_PORT@@;
     listen [::]:@@SECONDARY_PORT@@;