Featured Nginx PageSpeed Nginx Pagespeed Troubleshooting steps

How Centmin Mod Nginx enables and configures Nginx ngx_pagespeed module ngx_pagespeed install on Centmin Mod - Menu based Nginx installer for CentOS servers

To troubleshooting Nginx Pagespeed when certain filters do not do what you expect them to do you should first enable the pagespeed messages and console features outlined at ngx_pagespeed install on Centmin Mod - Menu based Nginx installer for CentOS servers. Then you can exclude specific urls from pagespeed via pagespeed disallow directives as outlined here.

This will give you access to new Nginx Pagespeed stats and admin pages from outlined location urls listed in /usr/local/nginx/conf/pagespeedhandler.conf. You will need to add your own ISP IP address to each allow yourip; for each location line, so you can access them.

Full instructions at ngx_pagespeed install on Centmin Mod - Menu based Nginx installer for CentOS servers.

Code:

location /ngx_pagespeed_statistics { allow 127.0.0.1; deny all; }
location /ngx_pagespeed_global_statistics { allow 127.0.0.1; deny all; }
location /ngx_pagespeed_message { allow 127.0.0.1; deny all; }
location /pagespeed_console { allow 127.0.0.1; deny all; }
location ~ ^/pagespeed_admin { allow 127.0.0.1; deny all; }
location ~ ^/pagespeed_global_admin { allow 127.0.0.1; deny all; }

Then you should be able to access the message log from yourhostname.com/ngx_pagespeed_message as well as access the pagespeed admin pages which were recently added to ngx_pagespeed 1.8.31-2 beta PageSpeed Admin Pages - PageSpeed Module — Google Developers

For example

PageSpeed Message
Normal to have no permission entries if you have defined Disallow directives in pagespeed.conf or have 3rd party urls like Google fonts



PageSpeed console page



PageSpeed Statistics output

---

Code:

timestamp_:                                            1401363934578
cache_time_us:                                                276039
cache_hits:                                                      575
cache_misses:                                                    231
cache_backend_hits:                                              634
cache_backend_misses:                                            172
cache_fallbacks:                                                   0
cache_expirations:                                                 0
cache_inserts:                                                   395
cache_deletes:                                                     0
instrumentation_filter_script_added_count:                         0
cache_extensions:                                               9285
not_cacheable:                                                     0
critical_css_beacon_filter_script_added_count:                   446
critical_css_no_beacon_due_to_missing_data:                        0
critical_css_skipped_due_to_charset:                               0
critical_images_beacon_filter_script_added_count:                574
css_combine_opportunities:                                      2964
css_file_count_reduction:                                       1337
css_filter_blocks_rewritten:                                     185
css_filter_parse_failures:                                         1
css_filter_fallback_rewrites:                                      1
css_filter_fallback_failures:                                      0
css_filter_rewrites_dropped:                                       0
css_filter_total_bytes_saved:                                 -59678
css_filter_total_original_bytes:                            10366208
css_filter_uses:                                                4359
flatten_imports_charset_mismatch:                                  0
flatten_imports_invalid_url:                                       0
flatten_imports_limit_exceeded:                                   84
flatten_imports_minify_failed:                                     0
flatten_imports_recursion:                                         0
flatten_imports_complex_queries:                                   0
num_css_inlined:                                                1469
css_imports_to_links:                                              0
css_elements_moved:                                                1
num_css_used_for_critical_css_computation:                      3421
num_css_not_used_for_critical_css_computation:                  4808
num_dedup_inlined_images_candidates_found:                         0
num_dedup_inlined_images_candidates_replaced:                      0
domain_rewrites:                                                   0
google_analytics_page_load_count:                                  0
google_analytics_rewritten_count:                                  0
font_service_input_resource_hit:                                   0
font_service_input_resource_recent_fetch_failure:                  0
font_service_input_resource_recent_uncacheable_treated_as_miss:    0
font_service_input_resource_recent_uncacheable_treated_as_failure: 0
font_service_input_resource_miss:                                 12
image_file_count_reduction:                                        0
image_rewrites:                                                  149
image_resized_using_rendered_dimensions:                           0
image_norewrites_high_resolution:                                  0
image_rewrites_dropped_intentionally:                             26
image_rewrites_dropped_decode_failure:                             0
image_rewrites_dropped_mime_type_unknown:                          0
image_rewrites_dropped_server_write_fail:                          0
image_rewrites_dropped_nosaving_resize:                            0
image_rewrites_dropped_nosaving_noresize:                         26
image_rewrites_dropped_due_to_load:                                0
image_rewrites_squashing_for_mobile_screen:                        0
image_rewrite_total_bytes_saved:                              217228
image_rewrite_total_original_bytes:                          1018942
image_rewrite_uses:                                            17225
image_inline:                                                   7940
image_webp_rewrites:                                             100
image_rewrite_latency_total_ms:                                 4102
image_ongoing_rewrites:                                            0
image_webp_conversion_gif_timeouts:                                0
image_webp_conversion_png_timeouts:                                0
image_webp_conversion_jpeg_timeouts:                               0
image_webp_alpha_timeouts:                                         0
image_webp_opaque_timeouts:                                        0
in_place_oversized_opt_stream:                                     0
in_place_uncacheable_rewrites:                                     0
inserted_ga_snippets:                                              0
javascript_blocks_minified:                                     7851
javascript_libraries_identified:                                   0
javascript_minification_failures:                                  0
javascript_total_bytes_saved:                                 986721
javascript_total_original_bytes:                            11728376
javascript_minify_uses:                                         7884
javascript_reducing_minifications:                              7831
javascript_minification_disabled:                                  0
javascript_did_not_shrink:                                         0
javascript_failed_to_write:                                        0
js_file_count_reduction:                                        3589
num_js_inlined:                                                   14
num_local_storage_cache_candidates_found:                          0
num_local_storage_cache_stored_total:                              0
num_local_storage_cache_stored_images:                             0
num_local_storage_cache_stored_css:                                0
num_local_storage_cache_candidates_added:                          0
num_local_storage_cache_candidates_removed:                        0
converted_meta_tags:                                            1484
split_html_beacon_filter_script_added_count:                       0
num_rewrites_abandoned_for_lock_contention:                        0
num_distributed_rewrite_successes:                                 0
num_distributed_rewrite_failures:                                  0
num_distributed_metadata_failures:                                 0
num_deadline_alarm_invocations:                                   17
url_input_resource_hit:                                            0
url_input_resource_recent_fetch_failure:                          20
url_input_resource_recent_uncacheable_treated_as_miss:             0
url_input_resource_recent_uncacheable_treated_as_failure:         39
url_input_resource_miss:                                          59
url_trims:                                                         0
url_trim_saved_bytes:                                              0
resource_url_domain_acceptances:                               92928
resource_url_domain_rejections:                                21756
rewrite_cached_output_missed_deadline:                          1516
rewrite_cached_output_hits:                                    77207
rewrite_cached_output_misses:                                   2325
resource_404_count:                                             6104
slurp_404_count:                                                   0
total_page_load_ms:                                                0
page_load_count:                                                   0
resource_fetches_cached:                                         575
resource_fetch_construct_successes:                              101
resource_fetch_construct_failures:                                 0
num_cache_control_rewritable_resources:                         1324
num_cache_control_not_rewritable_resources:                      118
num_flushes:                                                    1686
num_fallback_responses_served:                                     0
num_proactively_freshen_user_facing_request:                       0
num_fallback_responses_served_while_revalidate:                    0
num_conditional_refreshes:                                         0
ipro_served:                                                       0
ipro_not_in_cache:                                                 0
ipro_not_rewritable:                                               0
downstream_cache_purge_attempts:                                   0
successful_downstream_cache_purges:                                0
total_fetch_count:                                               666
total_rewrite_count:                                            1623
num_rewrites_executed:                                          1070
num_rewrites_dropped:                                              0
num_resource_fetch_successes:                                     12
num_resource_fetch_failures:                                      59
html-worker-queue-depth:                                           0
rewrite-worker-queue-depth:                                        0
low-priority-worked-queue-depth:                                   0
cache_batcher_dropped_gets:                                        0
critical_images_valid_count:                                    1335
critical_images_expired_count:                                    38
critical_images_not_found_count:                                 250
critical_css_valid_count:                                          0
critical_css_expired_count:                                        0
critical_css_not_found_count:                                      0
critical_selectors_valid_count:                                 1226
critical_selectors_expired_count:                                 16
critical_selectors_not_found_count:                              254
serf_fetch_request_count:                                         71
serf_fetch_bytes_count:                                        30070
serf_fetch_time_duration_ms:                                     859
serf_fetch_cancel_count:                                           0
serf_fetch_active_count:                                           0
serf_fetch_timeout_count:                                          0
serf_fetch_failure_count:                                          0
serf_fetch_cert_errors:                                            0
memcache_timeouts:                                                 0
memcache_last_error_checkpoint_ms:                     1401359532004
memcache_error_burst_size:                                         0
file_cache_bytes_freed_in_cleanup:                                 0
file_cache_cleanups:                                               0
file_cache_disk_checks:                                            4
file_cache_evictions:                                              0
file_cache_write_errors:                                           0
file_cache_deletes:                                                0
file_cache_hits:                                                 236
file_cache_inserts:                                              384
file_cache_misses:                                               366
lru_cache_deletes:                                                 0
lru_cache_hits:                                                    0
lru_cache_inserts:                                                 0
lru_cache_misses:                                                  0
shm_cache_deletes:                                                 0
shm_cache_hits:                                               344521
shm_cache_inserts:                                              1835
shm_cache_misses:                                               1737
memcached_async_deletes:                                           0
memcached_async_hits:                                            624
memcached_async_inserts:                                        1834
memcached_async_misses:                                         1513
memcached_blocking_deletes:                                        0
memcached_blocking_hits:                                        2125
memcached_blocking_inserts:                                     2281
memcached_blocking_misses:                                      2300
compressed_cache_corrupt_payloads:                                 0
compressed_cache_original_size:                                    0
compressed_cache_compressed_size:                                  0
pcache-cohorts-beacon_cohort_deletes:                              0
pcache-cohorts-beacon_cohort_hits:                              2000
pcache-cohorts-beacon_cohort_inserts:                           2017
pcache-cohorts-beacon_cohort_misses:                             654
pcache-cohorts-dom_deletes:                                        0
pcache-cohorts-dom_hits:                                         264
pcache-cohorts-dom_inserts:                                      446
pcache-cohorts-dom_misses:                                      1810
ipro_recorder_resources:                                           0
ipro_recorder_inserted_into_cache:                                 0
ipro_recorder_not_cacheable:                                       0
ipro_recorder_failed:                                              0
ipro_recorder_dropped_due_to_load:                                 0
ipro_recorder_dropped_due_to_size:                                 0
current-fetch-queue-size:                                          0
queued-fetch-count:                                                0
dropped-fetch-count:                                               0
child_shutdown_count:                                              0
cache_flush_count:                                                 0
cache_flush_timestamp_ms:                                          0
statistics_404_count:                                              0
http_fetches:                                                      0
http_bytes_fetched:                                                0
http_approx_header_bytes_fetched:                                  0

 

Also for CSS and JS combining read the documentation as there are a number of max bytes and length limitations which may prevent CSS and JS files from combining.

• combine_css
• rewrite_css
• combine_javascript
• rewrite_javascript

Note:

If you're using https/SSL need additional settings which are not found in my forum's posted pagespeed.conf https://developers.google.com/speed/pagespeed/module/https_support

For example if I had https/SSL enabled on the forums I need to add to pagespeed.conf this line. Changing your paths appropriately for your domain of course.

Code:

pagespeed LoadFromFile "https://community.centminmod.com" "/home/nginx/domains/community.centminmod.com/public";

 

Also if all else fails, search the official channels for Nginx PageSpeed

• ngx_pagespeed issues tracker https://github.com/pagespeed/ngx_pagespeed/issues
• Google Group at https://groups.google.com/forum/#!forum/ngx-pagespeed-discuss

 

If you have problems with Google Adsense's beta responsive async ad banner code and Nginx PageSpeed where Adsense banners turn up blank within your site or Xenforo forums, then read how to modify your Google Adsense responsive async code to fix this at https://community.centminmod.com/threads/ngx_pagespeed-advertising-conflicts.186/page-2#post-1187

 

ngx_pagespeed 1.9.32-1 beta has added more useful stats to Nginx PageSpeed admin stats console - full details at Nginx PageSpeed - Admin Stats Console Revamp in ngx_pagespeed 1.9.32-1 beta!

 

Update mod_pagespeed and ngx_pagespeed documentation is now listed together at https://modpagespeed.com/doc/. Example for URL control see https://modpagespeed.com/doc/restricting_urls

 

Update looks like indeed pagespeed might need these settings in pagespeed.conf PageSpeed HTTPS Support

For CentOS

Code (Text):

  # https://www.modpagespeed.com/doc/https_support
   pagespeed SslCertDirectory /etc/pki/tls/certs;
   pagespeed SslCertFile /etc/pki/tls/cert.pem;