Re: [jetty-users] Setting text/javascript encoding to utf8 with Jetty 10

[Joakim Erdfelt <joakim@xxxxxxxxxxx>]

I have problems that my UTF8 file is displayed wrongly in the browser -

  https://wordsbyfarber.com/Consts-ru.js

That is because the document itself is saved in the "windows-1252" charset.

No amount of fiddling with the `Content-Type` will fix that.

You'll have to fix your source document to be UTF-8 first.

Joakim Erdfelt / joakim@xxxxxxxxxxx

On Tue, Oct 3, 2023 at 9:35 AM Alexander Farber via jetty-users <jetty-users@xxxxxxxxxxx> wrote:

Thank you Joakim for the extensive answer, however -

On Tue, Oct 3, 2023 at 2:23 PM Joakim Erdfelt via jetty-users <jetty-users@xxxxxxxxxxx> wrote:

Per the _javascript_ RFC, the `text/_javascript_` mime-type has an optional `charset` parameter.

The behavior is documented at https://datatracker.ietf.org/doc/html/rfc9239#name-charset-parameter

Essentially, if the charset is unspecified, then the encoding is UTF-8.

> the encoding is unfortunately not set to utf8 (like it is for the served json files).

For JSON, the charset parameter is not used.

Per spec, JSON is always UTF-8.

See: https://www.rfc-editor.org/rfc/rfc8259#section-8.1

In Jetty, the json encoding is specified as an assumed UTF-8.

See: https://github.com/eclipse/jetty.project/blob/jetty-10.0.16/jetty-http/src/main/resources/org/eclipse/jetty/http/encoding.properties

This means the `charset` parameter is not produced when generating the `Content-Type` header, and is ignored when parsing the `Content-Type` header.

 > Is there a way to enforce that without compiling a custom version of Jetty?

You can customize the in-place `MimeTypes` for a context.

servletContextHandler.getMimeTypes().addMimeMapping("txt", "text/_javascript_;charset=UTF-8");

or

webappContext.getMimeTypes().addMimeMapping("txt", "text/_javascript_;charset=UTF-8");

or, If you have a WEB-INF/web.xml in your webapp, you can add a `<mime-mapping>` entry.

  <mime-mapping>
    <extension>js</extension>
    <mime-type>text/_javascript_;charset=UTF-8</mime-type>
  </mime-mapping>

I have problems that my UTF8 file is displayed wrongly in the browser -

  https://wordsbyfarber.com/Consts-ru.js

The browser displays pairs of junk characters instead of cyrillic letters and from my (limited) experience having ";charset=utf8" in the header would help it.

So I have followed your suggestion and have extended the src/main/webapp/WEB-INF/web.xml with:

<?xml version="1.0" encoding="UTF-8"?>

<web-app metadata-complete="false" 

         version="3.1" 

         xmlns="http://xmlns.jcp.org/xml/ns/javaee" 

         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 

         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">

    <servlet>

        <servlet-name>WordsServlet</servlet-name>

        <servlet-class>de.afarber.WordsServlet</servlet-class>

    </servlet>

    <servlet-mapping>

        <servlet-name>WordsServlet</servlet-name>

        <url-pattern>/</url-pattern>

    </servlet-mapping>

    <mime-mapping>

        <extension>js</extension>

        <mime-type>text/_javascript_;charset=UTF-8</mime-type>

    </mime-mapping>

</web-app>

Unfortunately the URL still returns the headers without "UTF-8" in there:

HTTP/1.1 200 OK

last-modified: Tue, 03 Oct 2023 09:52:40 GMT

content-type: text/_javascript_

accept-ranges: bytes

vary: Accept-Encoding

content-encoding: gzip

server: Jetty(10.0.16)

connection: close

Best regards
Alex

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