I opened my website in Chrome last night, then closed that tab, but didn't close browser. Today I failed to open my site in a new tab because jQuery(not use CDN) hits a syntax error: unexpected end of input.
My site always hits this error no matter how many times I refresh. But the error didn't happen again after hard refresh.
This problem happens many times in recent months.
I checked Chrome devtool, it says my jquery.min.js is loaded from memory cache. And it is not a whole file, only contains part of jquery library. That's why I got syntax error.
I did some research from google:
The lifetime of memory cache is attach to the lifetime of render process, which roughly corresponds to a tab.
So if I create a new tab to visit my site, stands to reason, jQuery should not be loaded from memory cache.
I expect browser do not load my files from memory again if I visit site in new tab.
Is there anything I can do to locate the problem source and fix it?
EDIT (2019-05-13):
Today hit this error again, but fortunately, I found new point seems helpful to this problem.
This is that request:
See status code is 206 Partial Content (from memory cache).
And I have no idea why my request header contains 'Range' field.
You can't detect newtab in browser and load your jquery.min.js,But you can avoid loading from cache by adding timestamp into suffix of your lib like follows.
http://yoursite.com/lib/js/jquery.min.js?1557301884
You can achieve this in two ways
Case:1 If you are using server side page rendering means(PHP,JSP) just print the timestamp
Case:2 If Client side means some javascript stuff you have to do
Related
In one of the online documents that talks about appcache for HTML5, it indicates that the cached files get updated once an offline user reconnects. I checked the original HTML5 appcache definition by W3, and I am not able to find anything that supports this statement.
Does anyone know if this is to be true?
Thanks in advance
MDN says the following, although if you scroll up on that page it says it's being deprecated.
If an application cache exists, the browser loads the document and its associated resources directly from the cache, without accessing the network. This speeds up the document load time.
The browser then checks to see if the cache manifest has been updated on the server.
If the cache manifest has been updated, the browser downloads a new version of the manifest and the resources listed in the manifest. This is done in the background and does not affect performance significantly.
And logic tells me that it would also depend on the app you're using, server you're trying to connect to and any special settings it might have, how long your browser keeps it's history, what it keeps, and if you saved the page to view offline - whether or not you have all the code/images saved in the right location(s).
Example:
Imagine you saved a page to view offline, and that page has a JS event handler that ran a while loop that did an ajax request every n seconds to do something, like make a number on a page change as long as you were online... As long as the loop is running, you suddenly connect to the internet, and it makes the request to the proper url with the right arguments, then it should go through, even though the url in your browser might say something like file:///C:/Users/you/Desktop/....
I've done this before, even though my url was like the one above. One time I was using braintree's drop-in javascript to a website, and using it's api on my backend. Trying to load the page when offline = Nothing. Online = Updated the spot on the page just fine when I had the required arguments, and it was pointing to the right url. If I got offline again, I could refresh the page, see the same images loaded in the <div>, but I couldn't send any data with it.
Unfortunately I cannot put the code here because despite all kinds of debugging I cannot point to the problem to present the problematic segment of the code. If I try to load a HTML which in turn has other requests (js,css,png, etc.), it loads all except one... The server/browser hangs for some time and then after about a minute or so does actually load! If I try to test the server with individual manual requests of these very URLs in the HTML file, it works fine.
While tying to load the HTML file, Chrome Network tab shows "pending..." of one request or sometimes two. But ultimately all the URLs requested are served. Thats what bugs me...
I tried to set http.globalAgent.maxSockets to 100 as suggested here as the HTML file would make more than 8 requests for the different js, css, etc. This did not help either.
I have reached a deadend. Any help would be appreciated.
I've got an odd question. Say I have two HTML pages index1.html and index2.html. In both the pages is some jpg image called "Hello". When I use the browser to point to say www.testing.com/index1.html the browser will load index1.html and the image Hello.
Now my question is when I go click on some link in index1.html that takes me to index2.html, will the browser look to go to back to the server to get image Hello or will it use the Hello image used in index1.html?
It depends on the caching headers the server sends out alongside the image.
There are several ways in which caching can be done.
When a resource is served with an expiry date in the future, the browser will use its cached copy until that date is reached (or the cache is emptied or a refresh forced.
Another way is for the server to listen to the If-modified-since request header. The server can then check whether the resource has been modified since that date. If it hasn't, it will return a 304 not modified status; otherwise, the updated resource.
The Apache Caching guide is a (lengthy) introduction to the subject.
To see in your browser what caching rules apply, open its developer tools and look for the "Net" tab. It's a list of all the requests that were made in connection with the current page. It'll tell you whether a resource was loaded from the server, or a cached copy used.
For example, this result on a Stack Overflow image from Chrome's developer tools:
suggests the image was cached. When I click that row, I can switch to the "header" view, where I can see the exact caching instructions the server sends:
It means that as long as the browser has a cached copy of the image, it will keep on using that without ever checking with the server until December 17, 2014.
Different browsers handle this differently. It can also depend on user settings. Users can set the browser to cache nothing if they so desire.
This is my first website I'm sorry if I've done something incorrectly. All help very much appreciated.
The problem.
I am currently using picasa's web album. ( I use this so my client should easily be able to update the pictures being show). When I load the page It does take a second or two for the album to show up. Yet on other computers it just does not show up at all.
The question
Why does the embedded gallery app show up for me but not for others?
Also Is there a better alternative.
My website Gallery
When you open the JavaScript console you're greeted with:
Failed to load resource: the server responded with a status of 404 (Not Found) https://picasaweb.google.com/data/feed/api/user/114335947299595812751/albumid/5880485482955492337?kind=photo&alt=rss
This means that the feed you're trying to load can't be found (or can no longer be found, at any rate).
To resolve this you'll need to point your embed code (on line 23 of your gallary.html file) a working address.
I imagine it loads for you because your page is cached. Try ctrl+F5 to do a hard refresh; failing that, clear your browser's cache and refresh.
I have an unattended touch screen kiosk application which needs to be able to automatically reload the browser home page after a network outage has occurred. At the moment the browser will display an "Unable to connect to the internet" error and will wait for a manual reload to be carried out before proceeding. Can this be automated?
I've searched for plugins and have found some plugins which deal with auto-reload but they don't seem to work in this context. I am guessing that the plugin is only active when a page is loaded so in this case with an error condition, perhaps the plugin is not active.
One alternative might be to override the error page which is displayed by Chrome but I don't know if this is possible. I could then instantiate a Javascript timer to try a reload every n seconds for example. Is this possible?
I saw a suggestion to use frames to allow the outer frame (which is never refreshed) to keep trying the loading of an inner frame but I'm not keen to use frames unless there is no alternative. I also saw a suggestion to use AJAX calls to check if the network was working before attempting a page load but this seems overkill if there is a way to correct the error only when it has occurred rather than pre-empt an error for every page load.
Host system is Windows 7 by the way. I'm keen to keep the browser running if possible rather than kill and create a new browser process.
If you don't want to tackle chrome extension development, you could wrap your site in an iframe, and then periodically refresh the iframe from the parent frame. That way you don't need to worry about OS issues.
if the content were loaded from ajax from the start then the it could simply output a custom message on the page as it does a check via AJAX. Probably prevention over remedy is always recommended
Assuming linux, you could create an ifup script to simply relaunch the browser with something like
#!/bin/sh
killall google-chrome
DISPLAY=:0 google-chrome
On debian/ubuntu, edit /etc/network/interfaces to include a post-up line; Google ifupdown for other distros.
On windows, you'd do roughly the same with a PowerShell script.
If you really want the precise behaviour you describe (without restarting the whole browser), I suggest you develop a plugin/extension: http://code.google.com/chrome/extensions/getstarted.html
I know you are using Chrome, but in Firefox this is trivial by overriding the netError.xhtml page to do a setTimeout(location.reload, 10000);.