jQuery's jquery-1.10.2.min.map is triggering a 404 (Not Found)

Question

I\'m seeing error messages about a file, min.map, being not found:

GET jQuery\'s jquery-1.10.2.min.map is triggering a 404 (Not Found)

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Answer 1

You can remove the 404 by removing the line

//@ sourceMappingURL=jquery-1.10.2.min.map

from the top part of your jQuery file.

The top part of the jQuery file will look like this.

/*! jQuery v1.10.2 | (c) 2005, 2013 jQuery Foundation, Inc. | jquery.org/license
//@ sourceMappingURL=jquery-1.10.2.min.map
*/

Just change that to

/*! jQuery v1.10.2 | (c) 2005, 2013 jQuery Foundation, Inc. | jquery.org/license */

Purpose of a source map

Basically it's a way to map a combined/minified file back to an unbuilt state. When you build for production, along with minifying and combining your JavaScript files, you generate a source map which holds information about your original files. When you query a certain line and column number in your generated JavaScript you can do a lookup in the source map which returns the original location. Developer tools (currently WebKit nightly builds, Google Chrome, or Firefox 23+) can parse the source map automatically and make it appear as though you're running unminified and uncombined files. (Read more on this here)