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The stylesheet was not loaded because its MIME type, “text/html”, is not “text/css”.

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nairb1958
nairb1958
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I am sorry if this is not the place to ask this question. I am new to web development and have been trying to solve this issue for days. I have an ESP32 acting as an http server. I have developed web pages which have separate html, css, and javascript files. These work as expected when delivered locally (i.e. I double click on the the files), however, when they are served by the ESP the style sheet is ignored and I get the message

The stylesheet (url) was not loaded because its MIME type, “text/html”, is not “text/css”.

from Firefox debugger. The stylesheet is ignore across all browsers (Firefox, Chrome, Opera, Edge), however the error is only shown in Firefox. Normally, of course, I would expect an issue on the ESP32 side, however, the non-Firefox browsers do load the stylesheet (even tough they ignore it) and I am able to verify that the stylesheet is identical to the one served locally.

Oddly, if I open a Firefox tab and load the page, switching to developer mode causes several requests for the stylesheet and the styles are then applied. Subsequent refreshes of the page causes the style to be lost and closing/opening developer mode has no effect.

Although I have disabled javascript to try fix this problem, when javascript is loaded I get a similar message (except the javascript is loaded).

I believe I specified the MIME type because I exactly coped several examples

<meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" type="text/css" href="styles.css"> <title>My ESP32</title> Thanks for the help!

I am sorry if this is not the place to ask this question. I am new to web development and have been trying to solve this issue for days. I have an ESP32 acting as an http server. I have developed web pages which have separate html, css, and javascript files. These work as expected when delivered locally (i.e. I double click on the the files), however, when they are served by the ESP the style sheet is ignored and I get the message The stylesheet (url) was not loaded because its MIME type, “text/html”, is not “text/css”. from Firefox debugger. The stylesheet is ignore across all browsers (Firefox, Chrome, Opera, Edge), however the error is only shown in Firefox. Normally, of course, I would expect an issue on the ESP32 side, however, the non-Firefox browsers do load the stylesheet (even tough they ignore it) and I am able to verify that the stylesheet is identical to the one served locally. Oddly, if I open a Firefox tab and load the page, switching to developer mode causes several requests for the stylesheet and the styles are then applied. Subsequent refreshes of the page causes the style to be lost and closing/opening developer mode has no effect. Although I have disabled javascript to try fix this problem, when javascript is loaded I get a similar message (except the javascript is loaded). I believe I specified the MIME type because I exactly coped several examples <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"/> <meta name="viewport" content="width=device-width, initial-scale=1"/> <link rel="stylesheet" type="text/css" href="styles.css" /> <!--<link rel="stylesheet" type="text/css" href="name-of-stylesheet.css" /> --> <!-- <script type="text/javascript" src="ESP-UI.js"></script> --> <title>My ESP32</title> </head> Thanks for the help!

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nairb1958
nairb1958 Zadający pytanie
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I can't figure out how to edit my message, but for anybody else it turns out you have to explicitly describe the type of file via httpd_resp_set_type(req, resp_type )

So, for css resp_type has to be "text/css"

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