Skip to main content

Bad map file for jQuery 1.9.1 in the jQuery CDN

Quite a while back, Mike Taylor pointed out that the jQuery CDN has a minified copy of jQuery 1.9.1 with an incorrect map file reference. Basically, it refers to the map for jQuery 1.11.1, and that’s just wrong. If you are trying to debug a site that uses the minified jQuery 1.9.1 file, dev tools will get very confused and make a hard job even harder.

You might think that we could just edit the https://code.jquery.com/jquery-1.9.1.min.js file to point to the correct map file, which does exist as https://code.jquery.com/jquery-1.9.1.min.map. There are at least two problems with doing that. The first is that the file is heavily cached across the internet, since it’s been assumed for years that it will never change once the release occurs. Even if we edited the file, both the JavaScript and map file might never actually update at the point where they’re being used.

A second problem is even more serious. We’ve been advocating that developers use the script’s integrity attribute to ensure that the file you are including has not been modified since you originally wrote the script tag. If we modify the contents of the file this attribute will be wrong and the page will no longer include the file. This is likely to completely break the page! Given the age of jQuery 1.9.1 it is possible that many of the pages including this file are not being actively maintained. Thus, we can’t seriously consider changing the JavaScript file in any way, not even one byte.

The least disruptive option is to remove the jquery.min.map file that the jQuery 1.9.1 minified file references. It does not affect whether jQuery runs correctly for the visitors of a site. It only has the effect of disabling the source map. Because of these pitfalls of including the sourceMappingURL map reference in CDN JavaScript files that are often copied elsewhere, we no longer include it.
If you need to debug a site using one of these minified files, it is possible to manually associate a map file in Chrome. Open the minified source file, right click over the area of the minified source, and select “Add source map…”.

The incorrect jquery.min.map file has been removed from the jQuery CDN. We expect that there won’t be any observable change from removing this file, other than restoring sanity to debugging a site that uses jQuery 1.9.1. The jQuery 1.11.1 minified file does not reference its map, so it will continue to work fine and you can associate a map file as mentioned above.

Because caches are so aggressive on CDNs and across the internet, it’s possible that you may still see this map file for a while. If you see some unusual behavior that you think is related to the missing jquery.min.map file you can open a ticket on the CDN issue tracker.

Source:
Posted on by Dave Methvin
https://blog.jquery.com/2018/08/30/bad-map-file-for-jquery-1-9-1-in-the-jquery-cdn/
Labels:

Comments

Post a Comment

Popular posts from this blog

Install Spring Boot application as a Windows services.

I using  WinSW  to be wrapper for Spring Boot application to run as a Windows service (following section 61.3 of Spring Boot document). There few easy step to setup. Download WinSW binary distribution from website  https://github.com/kohsuke/winsw/releases Copy WinSW.exe into Spring Boot application folder (ex: my file is WinSW.Net4.exe) Rename your WinSW.exe to same as your jar file (for easy to remember). Create XML file name same as jar file. This file is using for configuration of Windows services. Put configuration for services wrapper in your xml file. 1 2 3 4 5 6 7 8 9 <?xml version="1.0" encoding="UTF-8"?> <service> <id>my-application-0.0.1</id> <name>my-application-0.0.1</name> <description>My Exaple Spring Boot Services</description> <executable>java</executable> <arguments>-jar -Xmx1024M -Xms128M "my-application-0.0.1.jar"</arguments> <logmode>rotate...
Post a Comment
Read more

CURL SSL error in WAMP

I facing problem about certificate error when I using curl to request HTTPS domain. I find cause of problem is there is no certificate configuration in PHP. Below is how to solve my problem. Here is sample of error: * About to connect() to notify-api.line.me port 443 (#0) * Trying {IP Address}... * connected * Connected to notify-api.line.me ({IP Address}) port 443 (#0) * SSL certificate problem, verify that the CA cert is OK. Details: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed * Closing connection #0 Step to solve this problem Download  Certificate Bundle Extract and put PEM file to your web server folder or other folder. Enable mod_ssl in Apache and php_openssl.dll in php.ini Add configuration into php.ini curl.cainfo="C:/wamp/cacert.pem" openssl.cafile="C:/wamp/cacert.pem" Restart Apache Service
Post a Comment
Read more

Bootstrap 4.1.3

Hot on the heels of v4.1.2, we’re shipping another patch release to address an issue with our browserslist config, fix some CSS bugs, make JavaScript plugins UMD ready, and improve form control rendering. Up next will be v4.2, our second minor release where we add some new features. But first, here are the highlights for v4.1.3. Pay attention to the change to  .form-control s which adds a new fixed  height . Fixed:  Moved the browserslist config from our  package.json  to a separate file to avoid unintended inherited browser settings across npm projects. Fixed:  Removed the  :not(:root)  selector from our  svg  Reboot styles, resolving an issue that caused all inline SVGs ignore  vertical-align  styles via single class due to higher specificity. Fixed:  Buttons in custom file inputs are once again clickable when focused. Improved:  Bootstrap’s plugins can now be imported separately in any contexts because they...
Post a Comment
Read more