this._implicitHeader is not a function #2754

738623786 · 2021-03-29T03:08:30Z

Visit "http://localhost:5000" after running "npm run serve"，I get the following error：
xxx\node_modules\vite\dist\node\cli.js:13753
this._implicitHeader();
^

TypeError: this._implicitHeader is not a function
at Http2ServerResponse.end (xxx\node_modules\vite\dist\node\cli.js:13753:14)
at Array.write (xxx\node_modules\vite\dist\node\chunks\dep-0776dd57.js:49039:9)
at listener (xxx\node_modules\vite\dist\node\chunks\dep-0776dd57.js:48312:15)
at onFinish (xxx\node_modules\vite\dist\node\chunks\dep-0776dd57.js:48243:5)
at callback (xxx\node_modules\vite\dist\node\chunks\dep-0776dd57.js:48104:10)
at Http2ServerRequest.onevent (xxx\node_modules\vite\dist\node\chunks\dep-0776dd57.js:48142:5)
at Http2ServerRequest.emit (events.js:315:20)
at endReadableNT (_stream_readable.js:1327:12)
at processTicksAndRejections (internal/process/task_queues.js:80:21)

github-actions · 2021-03-29T03:43:15Z

Hello @738623786. Please provide a online reproduction by codesandbox or a minimal GitHub repository. Issues labeled by need reproduction will be closed if no activities in 3 days.

Shinigami92 · 2021-03-29T05:01:45Z

@738623786 Please respect our Issue Template
Please open a new issue and use the Issue Template

gunters63 · 2021-03-31T05:25:14Z

I have the same issue and found the reason.

The culprit is the compression module for express which does not support http2:

Support for Node.js 8 native http2

The preview module of vite serve does use compress.

When I start chrome with the parameter --disable-http2 the error goes away.

I guess reproduction of this error needs a combination of a recent Chrome browser and Node . I use Chrome 89 and Node 14 LTS.

gunters63 · 2021-03-31T05:40:10Z

I patched vite locally in my node_modules folder according to the following commit which unfortunately was never merged into compress:

[Fix usage of undocumented _implicitHeader and _header]
(expressjs/compression@dbf7e73)

This fixed the error

patak-dev · 2021-03-31T05:51:42Z

Great finding @gunters63! Maybe you could do a PR to expressjs/compression showing this use case, it would be great if this was fixed. I'll reopen this issue with a bug:upstream label to track this.

gunters63 · 2021-03-31T07:13:29Z

Issue 122 is already unresolved now for 4 years.

If I understand correctly, there are still some hard to solve stability problems regarding compress and HTTP/2 which is why the proposed fix was never merged. So I don't think it makes sense to send a PR request to the compression maintainers.

I would suggest making the use of compress in vites server cli configurable, something like:

  if (config.server.compress) {
    app.use(compression())
  }

gunters63 · 2021-04-01T01:40:28Z

I wrote a comment now in the corresponding issue of compression.

gunters63 · 2021-06-08T11:39:51Z

I also replaced vite preview now with sirv-cli (see comment of Greenheart)

hanneswidrig · 2021-10-14T14:47:51Z

Hey I'm having this issue with a basic templated vite project, is there ever going to be a solution to this? When exactly does vite preview actually work?

jozefizso · 2021-11-05T13:54:55Z

vite preview fails with node v14.18.1 and v16.13.0 when we enable the https server option.

/home/jozef/outlook/node_modules/vite/dist/node/chunks/dep-85dbaaa7.js:91827
        this._implicitHeader();
             ^

TypeError: this._implicitHeader is not a function
    at Http2ServerResponse.end (/home/jozef/outlook/node_modules/vite/dist/node/chunks/dep-85dbaaa7.js:91827:14)
    at Array.write (/home/jozef/outlook/node_modules/vite/dist/node/chunks/dep-85dbaaa7.js:45268:9)
    at listener (/home/jozef/outlook/node_modules/vite/dist/node/chunks/dep-85dbaaa7.js:44541:15)
    at onFinish (/home/jozef/outlook/node_modules/vite/dist/node/chunks/dep-85dbaaa7.js:44472:5)
    at callback (/home/jozef/outlook/node_modules/vite/dist/node/chunks/dep-85dbaaa7.js:44333:10)
    at Http2ServerRequest.onevent (/home/jozef/outlook/node_modules/vite/dist/node/chunks/dep-85dbaaa7.js:44371:5)
    at Http2ServerRequest.emit (events.js:400:28)
    at endReadableNT (internal/streams/readable.js:1334:12)
    at processTicksAndRejections (internal/process/task_queues.js:82:21)
error Command failed with exit code 1.

When we disable the HTTPS this error does not happen.

Moshyfawn · 2021-11-15T21:00:48Z

Using Node 16.12.0 here. I've encountered this behavior:
Running vite preview results in TypeError: this._implicitHeader is not a function once the URL is reached in browsers like Safari 15.1, Chromium 95.0.4638.54. In Firefox 95.0b6, it fails if Private Browsing is used. It proceeds to serve the files otherwise.

Niputi · 2021-12-14T20:25:52Z

would be nice if someone could provide a full reproduction in gtihub repo with os/browser details.
I might have a fix for this but would need to be able reproduce error to know If I can fix it

Moshyfawn · 2021-12-15T10:00:21Z

would be nice if someone could provide a full reproduction in gtihub repo with os/browser details. I might have a fix for this but would need to be able reproduce error to know If I can fix it

Here's a StackBlitz sandbox (requires browser's WebContainer support) that's connected to a GH repo

Install deps
Run build cmd
Run preview cmd
Open https://localhost:5000

You might encounter some issues running preview cmd in StackBlitz, so it's better to do it on a local machine instead.

My experience, can reproduce in any browser other than Firefox every time 100% on Windows 11 & MacOS 12.0.1. In Firefox, it's either a Private Browsing tab or after some interaction with the app, idk.
Today tested on a MacOS Monterey 12.0.1 machine in Chromium 96.0.4664.45 & Safari 15.1

P.S. For Safari, Apple's using the 5000 port for their system stuff for some reason, so to get around it, you can add --port 3000 flag

Andrevwvm · 2022-01-11T14:32:54Z

vite preview still fails with node v14.18.3 when the https server option enabled.

Node.js v14.18.3
Vite v2.8.0-beta.1
Enabled https

Error:
\node_modules\vite\dist\node\chunks\dep-e4dc9ea2.js:68637
this._implicitHeader();
^

TypeError: this._implicitHeader is not a function
at Http2ServerResponse.end (C:\Projects\Fenetre.SiliconCore\Source\Fenetre.SiliconCore.Sample.WebVue\node_modules\vite\dist\node\chunks\dep-e4dc9ea2.js:68637:6)
at Array.write (C:\Projects\Fenetre.SiliconCore\Source\Fenetre.SiliconCore.Sample.WebVue\node_modules\vite\dist\node\chunks\dep-e4dc9ea2.js:40673:9)
at listener (C:\Projects\Fenetre.SiliconCore\Source\Fenetre.SiliconCore.Sample.WebVue\node_modules\vite\dist\node\chunks\dep-e4dc9ea2.js:39946:15)
at onFinish (C:\Projects\Fenetre.SiliconCore\Source\Fenetre.SiliconCore.Sample.WebVue\node_modules\vite\dist\node\chunks\dep-e4dc9ea2.js:39877:5)
at callback (C:\Projects\Fenetre.SiliconCore\Source\Fenetre.SiliconCore.Sample.WebVue\node_modules\vite\dist\node\chunks\dep-e4dc9ea2.js:39738:10)
at Http2ServerRequest.emit (events.js:400:28)
at endReadableNT (internal/streams/readable.js:1334:12)
at processTicksAndRejections (internal/process/task_queues.js:82:21)

hanneswidrig · 2022-01-11T14:37:28Z

@Andrevwvm I am also seeing this behavior, my setup is utilizing https: true which I assume is causing problems.

delebash · 2022-03-06T07:17:04Z

Any fix for this yet?

bluwy · 2022-03-06T08:14:36Z

Yes. #6557

738623786 added the pending triage label Mar 29, 2021

anncwb added the needs reproduction label Mar 29, 2021

github-actions bot removed the pending triage label Mar 29, 2021

Shinigami92 closed this as completed Mar 29, 2021

patak-dev reopened this Mar 31, 2021

patak-dev added bug: upstream Bug in a dependency of Vite and removed needs reproduction labels Mar 31, 2021

gunters63 mentioned this issue Apr 1, 2021

Support for Node.js 8 native http2 expressjs/compression#122

Open

Greenheart mentioned this issue Apr 24, 2021

Replace vite preview with sirv-cli until HTTP2 header compression issue is fixed Greenheart/pagecrypt#6

Closed

Niputi mentioned this issue Dec 29, 2021

fix: this._implicitHeader is not a function #6313

Merged

9 tasks

patak-dev closed this as completed in #6313 Dec 30, 2021

Niputi reopened this Jan 11, 2022

Niputi mentioned this issue Jan 11, 2022

still getting this._implicitHeader is not a function after installing vite latest version #6457

Closed

7 tasks

Niputi mentioned this issue Jan 18, 2022

fix: replacing compression with modern version #6557

Merged

9 tasks

patak-dev closed this as completed in #6557 Mar 8, 2022

github-actions bot locked and limited conversation to collaborators Mar 23, 2022

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this._implicitHeader is not a function #2754

this._implicitHeader is not a function #2754

738623786 commented Mar 29, 2021 •

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bluwy commented Mar 6, 2022

this._implicitHeader is not a function #2754

this._implicitHeader is not a function #2754

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