1702848 - On Edit and resend, Updating the body of the multipart request does not correctly update the Content-Length header

Status: NEW

(DevTools :: Netmonitor, defect, P3)

Description

[vlad]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0

Steps to reproduce:

If you submit a multipart form and click Edit and resend in the developer tools, and you add one character to the value of one input, you will see that the auto-calculated content-length will get reduced instead of increased.

This is because when we edit the data, firefox replaces all CRLF with LF, thus reducing the content-length

Tested on ESR and nightly on debian and ubuntu

Actual results:

Content-length changes as all CRLF are changed to LF, breaking RFC 7578 of multipart forms and making it impossible to replay them on specific apps (as they differ)

Expected results:

Firefox doesn't replace CRLF to LF for multipart forms

Comment 1

[Andrei Purice]

Setting a component for this issue in order to get the dev team involved.
If you feel it's an incorrect one please feel free to change it to a more appropriate one.

Comment 2

[Martin Stránský [:stransky] (ni? me)]

Can you please create a screencast of the issue? How-to is here [1].
Thanks.
[1] https://help.gnome.org/users/gnome-help/stable/screen-shot-record.html

Comment 3

[vlad]

Attachment: ff.webm

sorry for the delay here's how i reproduce with a very basic multipart form and a textarea, editing the textarea value reduces the content length (CLRF converted to LF)

Comment 4

[:gerard-majax]

Is this still an issue ?

Comment 5

[BugBot [:suhaib / :marco/ :calixte]]

Redirect a needinfo that is pending on an inactive user to the triage owner.
:Honza, since the bug has recent activity, could you have a look please?

For more information, please visit BugBot documentation.

Comment 6

[Jan Honza Odvarko [:Honza] (always need-info? me)]

Bomsy, can you reproduce this issue?

Comment 7

[Hubert Boma Manilla (:bomsy)]

I can reproduce the issue. Though the STR here tests on the old edit and resend panel. I tested with the new version (devtools.netmonitor.features.newEditAndResend set to true) anf the issue still exists.