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Why does FireFox incorrectly report "The image /path/imageFileName cannot be displayed because it contains errors."

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raddevus
raddevus
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Running FireFox Quantum 67.0.4 on Windows 10.

While developing a .NET Core 3.x WebAPI I was attempting to retrieve an image from the root and getting the following error: "The image /path/imageFileName cannot be displayed because it contains errors."

I then attempted to retrieve the image using Google Chrome and it provided a more correct error message: This localhost page can’t be found No webpage was found for the web address: https://localhost:5001/tmp547E.jpg

I noticed that even if I change the path to a file that doesn't exist FireFox still gives me this error.

Also, if I attempt to retrieve an HTML page that doesn't exist (https://localhost:5001/doesNotExist.htm) I see no error or any content at all in FireFox.

I do see one error message in FireFox console but it really isn't relevant to non-existent content: "The character encoding of the HTML document was not declared. The document will render with garbled text in some browser configurations if the document contains characters from outside the US-ASCII range. The character encoding of the page must be declared in the document or in the transfer protocol." doesNotExist.htm

However, in contrast, if I attempt to retrieve the page via Google Chrome then I get a valid error: This localhost page can’t be found No webpage was found for the web address: https://localhost:5001/doesNotExist.htm HTTP ERROR 404

Why doesn't FireFox provide 404 (not found) errors on localhost?

Running FireFox Quantum 67.0.4 on Windows 10. While developing a .NET Core 3.x WebAPI I was attempting to retrieve an image from the root and getting the following error: "The image /path/imageFileName cannot be displayed because it contains errors." I then attempted to retrieve the image using Google Chrome and it provided a more correct error message: This localhost page can’t be found No webpage was found for the web address: https://localhost:5001/tmp547E.jpg I noticed that even if I change the path to a file that doesn't exist FireFox still gives me this error. Also, if I attempt to retrieve an HTML page that doesn't exist (https://localhost:5001/doesNotExist.htm) I see no error or any content at all in FireFox. I do see one error message in FireFox console but it really isn't relevant to non-existent content: "The character encoding of the HTML document was not declared. The document will render with garbled text in some browser configurations if the document contains characters from outside the US-ASCII range. The character encoding of the page must be declared in the document or in the transfer protocol." doesNotExist.htm However, in contrast, if I attempt to retrieve the page via Google Chrome then I get a valid error: This localhost page can’t be found No webpage was found for the web address: https://localhost:5001/doesNotExist.htm HTTP ERROR 404 Why doesn't FireFox provide 404 (not found) errors on localhost?