net::ERR_CONTENT_LENGTH_MISMATCH returning large content when port-forwarding from devcontainer

[rokos-angus]

Type: Bug

VSCode 1.91.0-insider (reproducible with latest stable release)
Docker version 25.0.3, build 4debf41 (installed within WSL, not docker desktop)

Run local devcontainer within WSL (ubuntu 22.04 image)
Run any http webserver and port forward with vscode to windows host (I have best luck reproducing with flask python server)
Access content from windows host browser.
This seems to depend on the size of the content, most reliable when it is at least >100kb

Expected Behavior
Content is successfully displayed in the browser

Actual Behavior
Content appears to be truncated, browser logs
Failed to load resource: net::ERR_CONTENT_LENGTH_MISMATCH

It is worth noting that this issue does NOT happen when running and port forwarding the application in WSL directly, ONLY when running in a devcontainer

Extension version: 0.372.0
VS Code version: Code - Insiders 1.91.0-insider (21decd9342dd2e14f2a7cd2883f84e6ff43ea0df, 2024-06-11T06:46:21.055Z)
OS version: Windows_NT x64 10.0.22621
Modes:
Remote OS version: Linux x64 5.15.146.1-microsoft-standard-WSL2
Remote OS version: Linux x64 5.15.146.1-microsoft-standard-WSL2

System Info

Item	Value
CPUs	13th Gen Intel(R) Core(TM) i9-13900K (32 x 2995)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: enabled_on direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off video_decode: enabled video_encode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: enabled
Load (avg)	undefined
Memory (System)	127.76GB (68.02GB free)
Process Argv	--crash-reporter-id 134e0632-6bb4-4424-ba75-d813c8e8d17a
Screen Reader	no
VM	0%

Item	Value
Remote	Dev Container
OS	Linux x64 5.15.146.1-microsoft-standard-WSL2
CPUs	13th Gen Intel(R) Core(TM) i9-13900K (32 x 0)
Memory (System)	62.68GB (56.87GB free)
VM	0%

Item	Value
Remote	WSL: Ubuntu
OS	Linux x64 5.15.146.1-microsoft-standard-WSL2
CPUs	13th Gen Intel(R) Core(TM) i9-13900K (32 x 0)
Memory (System)	62.68GB (56.87GB free)
VM	0%

A/B Experiments

vsliv368:30146709
vspor879:30202332
vspor708:30202333
vspor363:30204092
vscod805cf:30301675
vsaa593cf:30376535
py29gd2263:31024238
c4g48928:30535728
2i9eh265:30646982
962ge761:30841072
pythongtdpath:30726887
welcomedialog:30812478
pythonidxpt:30768918
pythonnoceb:30776497
asynctok:30898717
dsvsc013:30777762
dsvsc014:30777825
dsvsc015:30821418
pythontestfixt:30866404
pythonregdiag2:30926734
pythonmypyd1:30859725
h48ei257:31000450
pythontbext0:30879054
accentitlementst:30870582
dsvsc016:30879898
dsvsc017:30880771
dsvsc018:30880772
cppperfnew:30980852
pythonait:30973460
jchc7451:31067543
showvideot:31016890
chatpanelt:31014475
g316j359:31013175
a69g1124:31018687
dvdeprecation:31040973
pythonprt:31036556
dwnewjupytercf:31046870
2f103344:31071589
nb_pri_only:31057983
fa862199:31048878
nativerepl1:31071684

[chrmarti]

Can you compare what the browser gets with the original? The WSL and Dev Containers extensions use the same port forwarding implementation, not sure what could cause this.

[rokos-angus]

Not quite sure what you mean by "the original"
I have created a reproduction repo at https://github.com/rokos-angus/devcontainer-content-mismatch

Using this project I consistently see the content mismatch error in the devcontainer here but not windows or wsl. Interested if you see similar

Container:

WSL:

[chrmarti]

Seeing it with Docker in WSL. I didn't see it on Mac. Using PowerShell to download from Docker in WSL shows that it sometimes works and sometimes doesn't get all bytes. Maybe we're closing some stream too early? /cc @alexr00

[vscodenpa]

This issue has been closed automatically because it needs more information and has not had recent activity. See also our issue reporting guidelines.

Happy Coding!

[rokos-angus]

@chrmarti @alexr00 what more info did you need? Seems it was reproducible