The character encoding of the plain text document was not declared - mootool script

Question

I just noticed that there is a warning message pops up when I view my mootool js script on FireFox browser    The warning message is  The character encoding of the plain text 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 file needs to be declared in the transfer protocol or file needs to use a byte order mark as an encoding signature   does that mean I have to add a Charset or something  but it is a script    Is there a solution for this

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In my case in ASP MVC it was a method in controller that was returning null to View because of a wrong if statement   if  condition        return null      Condition fixed and I returned View  Problem fixed  There was nothing with encoding but I don t know why that was my error   return View result      result is View s model

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FireFox is reporting that the response did not even specify the character encoding in the header  eg  Content-Type  text html  charset utf-8 and not just Content-Type  text plain    What web server are you using  Are you sure you are not requesting a non-existing page  404  that responds poorly

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If anyone is using SQL and they have meta tags there and still the error is shown  this happens because of your connection from  net to SQL    In you appsettings json update your connection string to have  Persist Security Info True  So your connection string should look like this     DefaultConnection    Server   server   Initial Catalog   db   Persist Security Info True User ID   user   Password   pass   MultipleActiveResultSets False Encrypt True TrustServerCertificate False Connection Timeout 30

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I got this error using Spring Boot  in Mozilla    because I was just testing some basic controller -  service -  repository communication by directly returning some entities from the database to the browser  as JSON    I forgot to put data in the database  so my method wasn t returning anything    and I got this error   Now that I put some data in my db  it works fine  the error is removed    D

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Check your URL s protocol   You will also see this error if you host an encrypted page  https  and open it as plain text  http  in Firefox

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In your HTML it is a good pratice to provide the encoding like using the following meta like this for example    lt meta http-equiv  content-type  content  text html  charset utf-8    gt    But your warning that you see may be trigged by one of multiple files  it might not be your HTML document  It might be something in a javascript file or css file  if you page is made of up multiples php files included together it may be only 1 of those files   I dont think this error has anything to do with mootools  you see this message in your firefox console window  not  mootools script   maybe you simply need to re-save your html pages using a code editor that lets you specify the correct character encoding

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For HTML5    Simply add to your  lt head gt     lt meta charset  UTF-8  gt

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If you are using ASP NET Core MVC project  This error message can be shown then you have the correct cshtml file in your Views folder but the action is missing in your controller   Adding the missing action to the controller will fix it

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I fixed this issue by adding a slash at the beginning to my relative path

[firefox] The character encoding of the plain text document was not declared - mootool script

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