Ошибка DevTools failed to load SourceMap: Could not load content for влияет на работу страницы?
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DevTools failed to load SourceMap
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question
DevTools failed to load source map
48h ago, my Sharepoint online apps suddenly stopped working. I see this error in the browser console:
DevTools failed to load source map: Could not load content for https://amcdn.msftauth.net/meInlineBackCompat.min.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
It seems that this service: https://amcdn.msftauth.net is unreachable. There is a problem with loading authorizations for my apps
What can I do to solve this? Is this a general problem? I have no on premise servers. Everything is in the cloud.
I am experiencing the same issue. I am developing an spfx web part, and debugging using the hosted workbench. Unfortunately, I cannot confirm when this started because this is a new development effort.
3 Answers
Is there anything has been changed before the issue occurs?
Per my research you could try to uncheck «Enable JavaScript source maps» in developer tools settings.
Press F12 > Settings > Uncheck «Enable JavaScript source maps».
For Reference:
https://stackoverflow.com/questions/61339968/devtools-failed-to-load-sourcemap-could-not-load-content-for-chrome-extension
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Error message «DevTools failed to load SourceMap: Could not load content for chrome-extension://. «
I’m trying to display an image selected from the local machine and I need the location of that image for a JavaScript function and am unable to get the location of the image.
To get the image location, I tried using console.log, but nothing returns.
Here’s the HTML code:
DevTools failed to load SourceMap: Could not load content for chrome-extension://alplpnakfeabeiebipdmaenpmbgknjce/include.preload.js.map: HTTP error: status code 404, net::ERR_UNKNOWN_URL_SCHEME
12 Answers 12
That’s because Chrome added support for source maps.
Go to the developer tools ( F12 in the browser), then select the three dots in the upper right corner, and go to Settings.
Then, look for Sources, and disable the options:
If you do that, that would get rid of the warnings. It has nothing to do with your code. Check the developer tools in other pages and you will see the same warning.
Go to Developer tools → Settings → Console → tick «Selected context only». The warnings will be hidden. You can see them again by unticking the same box.
The «Selected context only» means only the top, iframe, worker and extension contexts. Which is all that you’ll need, the vast majority of the time.
The include.prepload.js file will have a line like below, probably as the last line:
Delete it and the error will go away.
For me, the problem was caused not by the application in development itself, but by the Chrome extension React Developer Tool. I solved it partially by right-clicking the extension icon in the toolbar, clicking «Manage extension» and then enabling «Allow access to files URLs.» But this measure fixed just some of the alerts.
You can confirm is extension-related by accessing your application in an anonymous tab without any extension enabled.
Fixing «SourceMap» error messages in the Development Tools Console caused by Chrome extensions:
Examples caused by McAfee extensions:
DevTools failed to load SourceMap: Could not load content for chrome-extension://klekeajafkkpokaofllcadenjdckhinm/sourceMap/content.map: HTTP error: status code 404, net::ERR_UNKNOWN_URL_SCHEME
DevTools failed to load SourceMap: Could not load content for chrome-extension://fheoggkfdfchfphceeifdbepaooicaho/sourceMap/chrome/content.map: HTTP error: status code 404, net::ERR_UNKNOWN_URL_SCHEME
DevTools failed to load SourceMap: Could not load content for chrome-extension://fheoggkfdfchfphceeifdbepaooicaho/sourceMap/chrome/iframe_handler.map: HTTP error: status code 404, net::ERR_UNKNOWN_URL_SCHEME
If you are developing, then you need «Enable JavaScript source maps» and «Enable CSS source maps» checked to be able see your source code in Chrome Developer Tools. Unchecking those takes away your ability to debug your source code. It is like turning off the fire alarm instead of putting out the fire. You do not want to do that.
Instead you want to find the extensions that are causing the messages and turn them off. Here is how you do that:
After determining which extensions caused the issue either:
Comments
zhb124404 commented Mar 17, 2021
Version
Browser and OS info
89.0.4389.90 64bit (cohort: 89_Win_72)
Steps to reproduce
just open a vue page served by webpack-dev-server
and then show:
DevTools failed to load SourceMap: Could not load content for chrome-extension://ljjemllljcmogpfapbkkighbhhppjdbg/build/env.js.map: HTTP error: status code 404, net::ERR_UNKNOWN_URL_SCHEME
What is expected?
What is actually happening?
In DevTool Console panel :
DevTools failed to load SourceMap: Could not load content for chrome-extension://ljjemllljcmogpfapbkkighbhhppjdbg/build/env.js.map: HTTP error: status code 404, net::ERR_UNKNOWN_URL_SCHEME
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PHenryy commented Apr 1, 2021
cordeiguerin commented Apr 5, 2021
same issue (but I run Linux Mint, rather than Windows)
jSadoski commented Apr 12, 2021 •
Same issue, but on macOS in Chrome and Brave.
Edit: macOS not iOS
jSadoski commented Apr 13, 2021
I wanted to follow up with more information about this issue. This breaks the whole extension for me with this error:
greaterDeltaCS commented May 21, 2021
Found a fix for this. In developer tools in chrome browser, go to settings(click the gear icon on the same bar as the console tab). Find and uncheck box that says Enable Javascript Sourcemap. exit settings and reload(I did a hard reload/empty cache. The error should be gone.
unnsteinngardars commented May 25, 2021
Found a fix for this. In developer tools in chrome browser, go to settings(click the gear icon on the same bar as the console tab). Find and uncheck box that says Enable Javascript Sourcemap. exit settings and reload(I did a hard reload/empty cache. The error should be gone.
Kudos! Did the trick for me.
givihuda commented Jun 1, 2021
Can somebody explain what this error means? I can’t tell if it’s causing the weird issue I’m having while modifying some code I’m not very familiar with that uses Laravel 8 and Vue (v?).
DevTools failed to load SourceMap: Could not load content for http://localhost:8002/js/vue-resize.esm.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
I’m not familiar with vue-resize.esm.js.map. is that a file in the /js folder that Google likes Chrome to look for to help DevTools understand your code?
jSadoski commented Jun 2, 2021
is that a file in the /js folder that Google likes Chrome to look for to help DevTools understand your code?
Yes, source maps helps DevTools unpack your minified code. It’s just for when you’re running in dev. See: MDN: Use a Source Map.
As to why this is breaking Vue DevTools I’m not totally sure.
redfox05 commented Jul 13, 2021 •
Found a fix for this. In developer tools in chrome browser, go to settings(click the gear icon on the same bar as the console tab). Find and uncheck box that says Enable Javascript Sourcemap. exit settings and reload(I did a hard reload/empty cache. The error should be gone.
This is a workaround, not a fix, because if you are using VueJS DevTools, its quite likely you are a developer wanting to use source maps for your own JS code, so wouldn’t want to untick this option as its a global flag for all sourcemaps.
The actual fix for this is one of two options:
P.s. I got this error for the utils.js script instead:
DevTools failed to load source map: Could not load content for chrome-extension://ljjemllljcmogpfapbkkighbhhppjdbg/build/util.js.map: HTTP error: status code 404, net::ERR_UNKNOWN_URL_SCHEME
givihuda commented Jul 13, 2021
Since I’m not very familiar with the Vue implementation on the project I referenced, I’m not sure the previous developers even implemented the sourcemap or Vue or whatever properly to begin with. I will be able to determine this better with more review of the code, which I can do when I use the project again, and if I find anything useful there that would be helpful for this thread, I’ll post here again. Thanks for the info.
DevTools failed to load SourceMap: Could not load content for https://unpkg.com/peerjs.min.js.map #721
Comments
nick0702y commented Aug 19, 2020
peerjs version used 1.3.1
Error loading peerjs.min.js.map
Error Report
DevTools failed to load SourceMap: Could not load content for https://unpkg.com/peerjs.min.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
Please help with this issue
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Nour490-code commented Aug 21, 2020
snehapaka commented Aug 21, 2020
szareian commented Aug 21, 2020 •
AlyNeumann commented Oct 1, 2020
germanvalentino commented Oct 14, 2020
abhay27chauhan commented Oct 21, 2020
2Gunz commented Dec 29, 2020
AJOO7 commented Jan 9, 2021
derd1011 commented Jan 12, 2021
karimk123 commented Feb 20, 2021
Is this still not fixed??
dcarlson661 commented Mar 9, 2021 •
Note: this is a current session only, reloads the page in the setting advanced
GiuseppeSaponieri commented Mar 15, 2021
dcarlson661 commented Mar 15, 2021
Hi,
Because I didn’t realize that it was a session only and when I restarted things and reconnected the message came back. So not knowing it was session only I started looking for other problems. Until I realized I had to go back into settings and re-check the box.
That’s all.
DC
germanvalentino commented Mar 15, 2021
I have the same problem, it seems to be not solved yet. I think nobady is working on this issue.
German
Guama1239 commented Mar 19, 2021
zahra-ove commented Mar 26, 2021
karimk123 commented Apr 8, 2021
Seniorprogrammer-123 commented Apr 9, 2021
ThePlatinum commented Apr 16, 2021
update on the fix please, it’s killing here
DhruvDutta commented Apr 18, 2021
byhyakimaro commented Apr 20, 2021
drug, this problem exists in 2020 and has nothing so far
Kana-creator commented Apr 22, 2021
DevTools failed to load SourceMap: Could not load content for https://unpkg.com/peerjs.min.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
Anny one to help me out with this issue
levlaz commented Apr 24, 2021
First, I think its worth noting that if you are having a problem with the peerJS library itself there is a 99.999% chance it has nothing to do with this particular issue.
This error happens because your browser is unable to load the source map file from unpkg. This should have no bearing on your ability to use this library at all. The source map is strictly used for debugging within a web browser.
The specific reason why this is happening is related to this issue from parcel which is what this project uses for creating the JS bundle: parcel-bundler/parcel#3000
If you look at the bottom of the peerjs bundle you will see this line:
The sourceMappingURL should not have / because it is causing the reference url to go to https://unpkg.com/peerjs.min.js.map (which 404s) instead of https://unpkg.com/peerjs@1.3.2/dist/peerjs.min.js.map where it actually lives.
I think the proper way to fix this is by changing the configuration of parcel to make the URL relative instead of absolute.
In the meantime, if you actually need to load the source map files you can do it manually in chrome using the full sourcemap url: https://unpkg.com/peerjs@1.3.2/dist/peerjs.min.js.map
advokrat commented Jul 12, 2021 •
Hey, I am in need of including this source map in a project, but it needs to load seamlessly on any device. Is there any workaround so that I can use this peerJS library robustly?
bagaswap111 commented Jul 27, 2021
Have same problem here. i am using safari for running development. might be caused by the browser suport (?). i’ve tried on ms edge too, though the result is the same, just like here 
may be would try this solution, however i havent got it clear how to change the parcel.
First, I think its worth noting that if you are having a problem with the peerJS library itself there is a 99.999% chance it has nothing to do with this particular issue.
This error happens because your browser is unable to load the source map file from unpkg. This should have no bearing on your ability to use this library at all. The source map is strictly used for debugging within a web browser.
The specific reason why this is happening is related to this issue from parcel which is what this project uses for creating the JS bundle: parcel-bundler/parcel#3000
If you look at the bottom of the peerjs bundle you will see this line:
The sourceMappingURL should not have / because it is causing the reference url to go to https://unpkg.com/peerjs.min.js.map (which 404s) instead of https://unpkg.com/peerjs@1.3.2/dist/peerjs.min.js.map where it actually lives.
I think the proper way to fix this is by changing the configuration of parcel to make the URL relative instead of absolute.
In the meantime, if you actually need to load the source map files you can do it manually in chrome using the full sourcemap url: https://unpkg.com/peerjs@1.3.2/dist/peerjs.min.js.map
any one have tried?
SecretSenator commented Jul 31, 2021
Have same problem here. i am using safari for running development. might be caused by the browser suport (?). i’ve tried on ms edge too, though the result is the same, just like here
may be would try this solution, however i havent got it clear how to change the parcel.
Hello,
First, I think its worth noting that if you are having a problem with the peerJS library itself there is a 99.999% chance it has nothing to do with this particular issue.
This error happens because your browser is unable to load the source map file from unpkg. This should have no bearing on your ability to use this library at all. The source map is strictly used for debugging within a web browser.
The specific reason why this is happening is related to this issue from parcel which is what this project uses for creating the JS bundle: parcel-bundler/parcel#3000
If you look at the bottom of the peerjs bundle you will see this line: