Change .js mime to "text/javascript"

[MylesBorins]

BPO	34875
Nosy	@asvetlov, @ammaraskar, @MylesBorins, @180909, @arhadthedev
PRs	bpo-34875: change .js mimetype to text/javascript #9678 bpo-34875:Change .js and .mjs mime to text/javascript #30740

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2018-10-02.22:28:39.501>
labels = ['library', '3.9', '3.10', '3.11']
title = 'Change .js mime to "text/javascript"'
updated_at = <Date 2022-01-21.11:06:31.601>
user = 'https://github.com/MylesBorins'

bugs.python.org fields:

activity = <Date 2022-01-21.11:06:31.601>
actor = 'arhadthedev'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2018-10-02.22:28:39.501>
creator = 'mylesborins'
dependencies = []
files = []
hgrepos = []
issue_num = 34875
keywords = ['patch']
message_count = 7.0
messages = ['326920', '326923', '327006', '327007', '327010', '345883', '411109']
nosy_count = 5.0
nosy_names = ['asvetlov', 'ammar2', 'mylesborins', 'wangjiahua', 'arhadthedev']
pr_nums = ['9678', '30740']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue34875'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

[MylesBorins]

I propose to change the mapping of file extension .js to mime type "text/javascript" from "application/javascript.

"text/javascript" is the currently documented best practice in the whatwg HTML spec.

https://html.spec.whatwg.org/multipage/scripting.html#scriptingLanguages:javascript-mime-type

[ammaraskar]

It should be noted that the HTML spec also says:

The term "JavaScript" is used to refer to ECMA-262, rather than the official term ECMAScript, since the term JavaScript is more widely known. Similarly, the MIME type used to refer to JavaScript in this specification is text/javascript, since that is the most commonly used type, despite it being an officially obsoleted type according to RFC 4329.

https://html.spec.whatwg.org/#dependencies:willful-violation

[asvetlov]

By RCF 4329 https://tools.ietf.org/html/rfc4329#page-9 text/javascript is obsoleted, application/javascript is a part of the standard.

WhatWg is a controversial group. Their specs don't always follow official standards but Python does.

Sorry, I should decline the proposal.

Feel free to raise an issue again if IETF will change their opinion.

[MylesBorins]

There is a IETF proposal that would make "text/javascript" no longer obsolete.

Will revisit at the point this lands

https://datatracker.ietf.org/doc/draft-ietf-dispatch-javascript-mjs/

[asvetlov]

We can return to the question when (and if) the draft will be accepted.

[MylesBorins]

Hey All,

I'd like to reopen this. We are almost done with the IETF standardization of .mjs, and part of this process is making obsolete application/javascript in favor of text/javascript.

--> https://datatracker.ietf.org/doc/draft-ietf-dispatch-javascript-mjs/

[arhadthedev]

Myles, it looks like the draft 14 contains a mismatch in 6.2.1:

6.2.1. text/ecmascript

Type name: application
Subtype name: ecmascript

In header it's text, in details it's application. Is it intended?

I believe that a typo wouldn't pass though fourteen revisions but nevertheless, just to be safe.

[mathiasbynens]

Following up to this old thread + this earlier discussion: RFC 9239 now unequivocally resolves this disagreement. Patch: #92627

[encukou]

This was reported later in #97646, and changed in #97934 (Python 3.12).