Can not find "locale.properties" file from PDF.js

Question

I use this plugin: PDF.js.

I am trying to solve the problems that show in console log.

Follow image:

Here is a simple project ready, only download and run project you will see the same problem. I've tried everything and I can not solve a problem.

Follow html:

<div style="width: 800px; height: 500px;">
    <iframe width="800" height="500" id="iframePdfViewer" seamless="seamless" scrolling="no" src="~/Scripts/pdfjs-dist/web/viewer.html"></iframe>
</div>

See another image that contains "locale.properties" file:

And I also get a lot of warnings from l10n.js. I downloaded it here: http://mozilla.github.io/pdf.js/ by clicking the "download" button.

Any solution ?

Answer 1

Adding .properties MIME type configuration inside web.config file should work:

<configuration>
  <!-- other stuff -->

  <system.webServer>
     <staticContent>
        <mimeMap fileExtension=".properties" mimeType="application/octet-stream" />
     </staticContent>
  </system.webServer>
</configuration>

If the project is already deployed in IIS (not IIS Express), go to site name => MIME Types => Add, and set .properties extension with application/octet-stream type as in provided image below:

Here is the console log view with all l10n.js errors disappear:

The reason behind usage of application/octet-stream is that the corresponding file should be treated as stream, even file contents are readable and stored in text format.

Reference: l10n.js - locale.properties 404 (Not Found)

Answer 2

If you are using .net core (2.1) try to add .properties as static file in your "public void Configure(IApplicationBuilder app, IHostingEnvironment env)" method

var provider = new FileExtensionContentTypeProvider();
provider.Mappings[".properties"] = "application/octet-stream"; 

app.UseSpaStaticFiles(new StaticFileOptions
{
      ContentTypeProvider = provider
});

Answer 3

Inspired by Lukáš Janeček, If you are using .net core(3.1). try to add the following code to your public void Configure(IApplicationBuilder app, IWebHostEnvironment env)

var provider = new FileExtensionContentTypeProvider();
provider.Mappings[".properties"] = "application/octet-stream";
app.UseStaticFiles(new StaticFileOptions()
{
     ContentTypeProvider = provider
});