### Description:
Since upgrading to 3.16+ it seems some Slack-compatible Incoโฆming Webhooks seem to not work any more. There isn't much detail other than what I can provide below with screenshots and relevant logs.
### Steps to reproduce:
1. Setup Channel and add user(s) to Channel
2. Setup Integration to use that channel
3. Copy Webhook URL to app to send webhooks to Rocket.Chat
### Expected behavior:
Webhook post content to channel
### Actual behavior:
No content shows
### Server Setup Information:
- Version of Rocket.Chat Server: **3.18.1**
- Operating System: **Ubuntu 18.04**
- Deployment Method: **docker**
- Number of Running Instances: **1**
- DB Replicaset Oplog: **Enabled**
- NodeJS Version: **v12.22.1**
- MongoDB Version: **4.0.17 / mmapv1 (oplog Enabled)**
### Client Setup Information
- Desktop App or Browser Version: **Latest Linux Electron App**
- Operating System: **Pop!_OS!**
### Additional context
![image](https://user-images.githubusercontent.com/14948644/133458986-f8b669a6-f5bd-495e-8a50-1541fa21eae0.png)
![image](https://user-images.githubusercontent.com/14948644/133459123-04ac51c9-ac4a-4d38-8b6f-e0090369c2ba.png)
### Relevant logs:
I20210915-14:57:17.184(0) Integrations โ Incoming WebHook.info Post integration: SupportPal Dev
I20210915-14:57:17.186(0) Integrations โ Incoming WebHook.debug @urlParams: { integrationId: 'AfWf54ZnXqAJf6nWF', token: 'nN2stSRrpENZdRzD3birmM28qT9WGTeKTvScf7HBDFQhAoc8' }
I20210915-14:57:17.187(0) Integrations โ Incoming WebHook.debug @bodyParams: {}
I20210915-14:57:17.188(0) API โ debug Success { statusCode: 200, body: { success: true } }
I20210915-14:57:17.189(0) API โ info 10.200.X.XXX - aDFNiCQWGwZX7ATD9 [2021-09-15T14:57:17.188Z] "POST /hooks/AfWf54ZnXqAJf6nWF/nN2stSRrpENZdRzD3birmM28qT9WGTeKTvScf7HBDFQhAoc8" 200 - "undefined" "GuzzleHttp/6.5.5 curl/7.58.0 PHP/7.2.24-0ubuntu0.18.04.8" |
I20210915-14:57:23.792(0) API โ debug Success { statusCode: 200, body: { queue: [ [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], [Object], ... 900 more items ], success: true } }
I20210915-14:58:37.488(0) Integrations โ Incoming WebHook.info Post integration: SupportPal Dev
I20210915-14:58:37.489(0) Integrations โ Incoming WebHook.debug @urlParams: { integrationId: 'AfWf54ZnXqAJf6nWF', token: 'nN2stSRrpENZdRzD3birmM28qT9WGTeKTvScf7HBDFQhAoc8' }
I20210915-14:58:37.490(0) Integrations โ Incoming WebHook.debug @bodyParams: {}
I20210915-14:58:37.491(0) API โ debug Success { statusCode: 200, body: { success: true } }
I20210915-14:58:37.492(0) API โ info 10.200.X.XXX - aDFNiCQWGwZX7ATD9 [2021-09-15T14:58:37.491Z] "POST /hooks/AfWf54ZnXqAJf6nWF/nN2stSRrpENZdRzD3birmM28qT9WGTeKTvScf7HBDFQhAoc8" 200 - "undefined" "GuzzleHttp/6.5.5 curl/7.58.0 PHP/7.2.24-0ubuntu0.18.04.8" |
I20210915-14:59:00.239(0) SyncedCron โ info Starting "Federation".