"Loading…" ajax error?

[James Proctor]

Another request from the developer…thanks for your continued support…Jim P.

Let me know if the plugin’s developer can set up the buffered output functionality from the non-debug plugin to be run along with an incoming request and send its output to the error log, so we can see if the issue that was affecting the previous plugin may still be present, and get some ideas on how it can be replicated.

(below in response to my query for clarification of above)

I’m referring to the current version of the plugin that’s installed. Assuming that the previous implementation of buffered output was the issue with the previous version of the plugin, then the issue should be resolved.

Since we haven’t confirmed the source of the issue yet, it may be a good idea to (if possible) have the same functionality that was in the previous plugin, where the output was being cached before the POST variables were read, running alongside the current functionality, and send that output to the error log. This should help to identify when their buffered output didn’t include the needed map name, while ensuring that the site itself still displays properly.

[Chris]

Hi,

I don’t think I can run requests in parallel, but you can always switch back to the original plugin or modify the version I sent you (the code in in mappress_query.php).

Buffering was just a guess – I was trying to think of something that might be uniquely configured on that server, or might be mangled by another plugin. Did that seem to fix the problem?

What do the PHP and Apache logs show during an error?

[James Proctor]

Let’s hold off on doing anything more until the support staff get back to me: yesterday I observed several more loading errors with your updated version of the plugin, and the logging may’ve given them additional clues. I’ll be in touch once I hear from them.

Sure appreciate your continued support! I’m pretty sure that it has to do with a setting on WPEngine, but given they are a huge WP provider it’s worth figuring it out for everyone involved.

Jim P.

[James Proctor]

Here is an update from a WPEngine engineer; any clues on your end? I doubt the below is the exact scenario, but you may have some ideas. Thanks…Jim P.

According to the HTTP Status code index, a 408 response means “server timed out waiting for the request”. That means that the browser took too long to send the data, and the server gave up waiting for it.

I’m not familiar enough with the plugin to know exactly what is happening, but is it possible that the plugin is attempting to send a very large amount of data to the server, and so the timeout is reached before the browser can send it?

[Chris]

Hi,

Is that related to the missing post parameters? It’s true that with a large mashup the amount of data can be fairly large – maybe a worst case of 1k per post – but a few hundred posts shouldn’t cause a timeout.

Maybe the back-end is running very slow. The fact that it’s intermittent might indicate a lot of users on your site (or someone else’s, if it’s a shared server).

If you think that’s the problem you can use posts_per_page to limit the mashup size.

[James Proctor]

Thanks. No, these are tiny mashups, with about a half-dozen geotagged posts. I’ll forward your response to the WPEngine folks.

Jim

[James Proctor]

Chris, long Firefox console output below…does this provide any clues? The WPEngine folks have given up on it. Thanks…Jim P.

Below is the debugger readout for: admin-bar.min.js

"undefined"!=typeof jQuery?("undefined"==typeof jQuery.fn.hoverIntent&&!function(a){a.fn.hoverIntent=function(b,c,d){var e={interval:100,sensitivity:7,timeout:0};e="object"==typeof b?a.extend(e,b):a.isFunction(c)?a.extend(e,{over:b,out:c,selector:d}):a.extend(e,{over:b,out:b,selector:c});var f,g,h,i,j=function(a){f=a.pageX,g=a.pageY},k=function(b,c){return c.hoverIntent_t=clearTimeout(c.hoverIntent_t),Math.abs(h-f)+Math.abs(i-g)<e.sensitivity?(a(c).off("mousemove.hoverIntent",j),c.hoverIntent_s=1,e.over.apply(c,[b])):(h=f,i=g,c.hoverIntent_t=setTimeout(function(){k(b,c)},e.interval),void 0)},l=function(a,b){return b.hoverIntent_t=clearTimeout(b.hoverIntent_t),b.hoverIntent_s=0,e.out.apply(b,[a])},m=function(b){var c=jQuery.extend({},b),d=this;d.hoverIntent_t&&(d.hoverIntent_t=clearTimeout(d.hoverIntent_t)),"mouseenter"==b.type?(h=c.pageX,i=c.pageY,a(d).on("mousemove.hoverIntent",j),1!=d.hoverIntent_s&&(d.hoverIntent_t=setTimeout(function(){k(c,d)},e.interval))):(a(d).off("mousemove.hoverIntent",j),1==d.hoverIntent_s&&(d.hoverIntent_t=setTimeout(function(){l(c,d)},e.timeout)))};return this.on({"mouseenter.hoverIntent":m,"mouseleave.hoverIntent":m},e.selector)}}(jQuery),jQuery(document).ready(function(a){var b,c,d,e=a("#wpadminbar"),f=!1;b=function(b,c){var d=a(c),e=d.attr("tabindex");e&&d.attr("tabindex","0").attr("tabindex",e)},c=function(b){e.find("li.menupop").on("click.wp-mobile-hover",function(c){var d=a(this);d.parent().is("#wp-admin-bar-root-default")&&!d.hasClass("hover")?(c.preventDefault(),e.find("li.menupop.hover").removeClass("hover"),d.addClass("hover")):d.hasClass("hover")||(c.stopPropagation(),c.preventDefault(),d.addClass("hover")),b&&(a("li.menupop").off("click.wp-mobile-hover"),f=!1)})},d=function(){var b=/Mobile\/.+Safari/.test(navigator.userAgent)?"touchstart":"click";a(document.body).on(b+".wp-mobile-hover",function(b){a(b.target).closest("#wpadminbar").length||e.find("li.menupop.hover").removeClass("hover")})},e.removeClass("nojq").removeClass("nojs"),"ontouchstart"in window?(e.on("touchstart",function(){c(!0),f=!0}),d()):/IEMobile\/[1-9]/.test(navigator.userAgent)&&(c(),d()),e.find("li.menupop").hoverIntent({over:function(){f||a(this).addClass("hover")},out:function(){f||a(this).removeClass("hover")},timeout:180,sensitivity:7,interval:100}),window.location.hash&&window.scrollBy(0,-32),a("#wp-admin-bar-get-shortlink").click(function(b){b.preventDefault(),a(this).addClass("selected").children(".shortlink-input").blur(function(){a(this).parents("#wp-admin-bar-get-shortlink").removeClass("selected")}).focus().select()}),a("#wpadminbar li.menupop > .ab-item").bind("keydown.adminbar",function(c){if(13==c.which){var d=a(c.target),e=d.closest("ab-sub-wrapper");c.stopPropagation(),c.preventDefault(),e.length||(e=a("#wpadminbar .quicklinks")),e.find(".menupop").removeClass("hover"),d.parent().toggleClass("hover"),d.siblings(".ab-sub-wrapper").find(".ab-item").each(b)}}).each(b),a("#wpadminbar .ab-item").bind("keydown.adminbar",function(c){if(27==c.which){var d=a(c.target);c.stopPropagation(),c.preventDefault(),d.closest(".hover").removeClass("hover").children(".ab-item").focus(),d.siblings(".ab-sub-wrapper").find(".ab-item").each(b)}}),a("#wpadminbar").click(function(b){("wpadminbar"==b.target.id||"wp-admin-bar-top-secondary"==b.target.id)&&(b.preventDefault(),a("html, body").animate({scrollTop:0},"fast"))}),a(".screen-reader-shortcut").keydown(function(b){var c,d;13==b.which&&(c=a(this).attr("href"),d=navigator.userAgent.toLowerCase(),-1!=d.indexOf("applewebkit")&&c&&"#"==c.charAt(0)&&setTimeout(function(){a(c).focus()},100))}),"sessionStorage"in window&&a("#wp-admin-bar-logout a").click(function(){try{for(var a in sessionStorage)-1!=a.indexOf("wp-autosave-")&&sessionStorage.removeItem(a)}catch(b){}}),navigator.userAgent&&-1===document.body.className.indexOf("no-font-face")&&/Android (1.0|1.1|1.5|1.6|2.0|2.1)|Nokia|Opera Mini|w(eb)?OSBrowser|webOS|UCWEB|Windows Phone OS 7|XBLWP7|ZuneWP7|MSIE 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hover":"hover",k=b),b=b.parentNode;if(k&&k.parentNode&&(l=k.parentNode,l&&"UL"==l.nodeName.toUpperCase()))for(d=l.childNodes.length;d--;)m=l.childNodes[d],m!=k&&(m.className=m.className?m.className.replace(g,""):"");for(d=f.length;d--;){for(j=!1,o=n.length;o--;)n[o]==f[d][1]&&(j=!0);j||(f[d][1].className=f[d][1].className?f[d][1].className.replace(e,""):"")}},j=function(b){for(;b&&b!=c&&b!=a;)"LI"==b.nodeName.toUpperCase()&&!function(a){var b=setTimeout(function(){a.className=a.className?a.className.replace(e,""):""},500);f[f.length]=[b,a]}(b),b=b.parentNode},k=function(b){for(var d,e,f,h=b.target||b.srcElement;;){if(!h||h==a||h==c)return;if(h.id&&"wp-admin-bar-get-shortlink"==h.id)break;h=h.parentNode}for(b.preventDefault&&b.preventDefault(),b.returnValue=!1,-1==h.className.indexOf("selected")&&(h.className+=" selected"),d=0,e=h.childNodes.length;e>d;d++)if(f=h.childNodes[d],f.className&&-1!=f.className.indexOf("shortlink-input")){f.focus(),f.select(),f.onblur=function(){h.className=h.className?h.className.replace(g,""):""};break}return!1},l=function(a){var 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(1.0|1.1|1.5|1.6|2.0|2.1)|Nokia|Opera Mini|w(eb)?OSBrowser|webOS|UCWEB|Windows Phone OS 7|XBLWP7|ZuneWP7|MSIE 7/.test(navigator.userAgent)&&(document.body.className+=" no-font-face")})}(document,window);

[Chris]

Hi,

I’m sorry to hear they’ve given up, especially since the issue is specific to that server.

The debug output looks like just the code for the WordPress admin bar, so it doesn’t offer much in the way of clues.

I have two suggestions:

1. Check the apache and PHP logs around the time of an error, they are critical for solving this kind of problem.

2. Run some tests with your other plugins deactivated and using a standard theme. It’s possible the issue is caused by some other code.

Finally, if you can find some sequence of steps to reproduce the failure that would be a big help – intermittent issues are always tough. If not the logs (#1) will help.

[James Proctor]

Chris, thanks. The WPEngine folks claim they’ve scoured the Apache/PHP logs. The theme/plugin incompatibility possibility is one we haven’t yet systematically explored as we have lot. And, since the problem is intermittent, the sequence of steps is nothing special: we just bring up the page and sometimes the mashup shows, at other times it says “Loading…” and never loads.

Oh well, I’ll keep in touch if further clues.

Regards,

Jim P.

[Author]

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