Serverless-offline: Non-GET HTTP requests hanging

[s16h]

Bug Report

Current Behavior

When sending a non-GET (e.g. POST) request to an httpApi endpoint, the request hangs. This doesn't happen with GET requests.

Sample Code

https://github.com/s16h/sls-offline-hanging-repro

Expected behavior/code
The expectation is that a POST request should return a response.

Environment

• serverless version: 2.16.1
• serverless-offline version: 6.8.0
• node.js version: v15.5.0
• OS: macOS 11.1
• python version: 2.7.16 and 3.9.1 (Haven't tested with other versions)

[Olcina]

Same behavior on my system from this morning too. I'm using typescript in an Ubuntu 20 machine. So, I think it could be related to a change either in the serverless-offline plugin or in the serverless framework itself. Maybe an analytics request on their side is hanging. The use of export SLS_DEBUG=true is not giving any clues either.

[johnathanmiller]

I just started experiencing this exact issue today as well.

serverless: 2.16.1
serverless-offline: 6.8.0
node.js: v15.5.0
OS: macOS 10.15.4

[dashmug]

I'm experiencing this problem as well.

[Stereobit]

Same here. Temporary downgrading node from v15.5.0 helped.

[mrflip]

To fix this, it's important that your yarn does not install node 15 as a dependency, which will happen if you use homebrew to install it. Here's how we brute-forced it:

brew deps -n node # uninstall all of these
brew uninstall node
brew uninstall yarn
node --version # should not work
yarn --version # should not work
brew install node@14
brew link node@14
node --version # should work, be 14.x
npm install -g yarn
hash -r
yarn --version
# re-install other things you uninstalled

It's possible that removing all the dependencies is unnecessary, so you could try just uninstalling yarn, unlinking node@15, and then re-installing yarn with npm and not homebrew. Haven't run the following but the commands would be something like:

brew uninstall yarn
brew unlink node
node --version # should not work
brew install node@14
brew link node@14
npm install -g yarn
hash -r
yarn --version

It's nearly certain someone who knows more command line flags of brew would be able to finesse this with less carnage, but I assume this will be resolved quickly.

[fabienjuif]

@mrflip did you know about "n"? I use this for a quite long time now and this is great!

https://github.com/tj/n

[robertfmurdock]

Same issue here. This is a pretty nasty blocker for using the new node js. I'm curious to learn which node js feature changed that this depended on. 🤔

[pduchesne]

Same here, had to downgrade node to v14.

[akikinyan]

I also downgraded node to v14 and it worked.

[the1adi]

Is there a fix coming for node 15?

[kenberkeley]

Culprit found!!! Thanks to https://github.com/dherault/serverless-offline/issues/1150#issuecomment-750866436

After my several tests, only Node v15.5.0 and v15.5.1 are not working.

[Guneetgstar]

I was using node v12.16.1, upgraded to v14.16.1 still the same issue.

[mskg]

Can confirm with 15*, 14.16.1 works.

[Guneetgstar]

Maybe it isn't coz of the node version? Coz I confirm that I am using the current LTS node v14.16.1 with the same problem. (Also all my API works just fine when deployed on AWS or invoked locally using sls invoke local)

[Guneetgstar]

To fix this, it's important that your yarn does not install node 15 as a dependency, which will happen if you use homebrew to install it.

Does that mean I might have multiple versions of node in my system? Can you please add some more info that why it fixes the issue or the issue appears at all? BDW I use npm and I don't have yarn.

[iamrutvik]

Works well on Node 15.14.0. Tested

[tnortman]

I just ran into this as well - was on node v12.16.1 and had to upgrade to node 14.16.1