9
votes
Accepted
Lightning components, CometD - Refused to connect to ... because it violates the following Content Security Policy directive
The error you are reporting is related to the fact that the Salesforce Platform does not yet provide a WebSocket server for Platform Events.
While waiting for this feature, you have to add this line ...
- 4,449
7
votes
Accepted
CometD Issues when subscribing to Platform Events
This is a know issue documented in the Platform Event project Build an Instant Notification App:
If you notice an "Exception during handling of messages Unrecognized
advice action handshake" ...
- 4,449
6
votes
CometD Issues when subscribing to Platform Events
I'm receiving this message as well. Not in the Trailhead but in my own code both within Visualforce page and withing a lightning component. I don't think you can catch this exception as it's caught by ...
- 159
5
votes
Accepted
How to publish Platform Event from aiosfstream python library?
I'm the author of aiosfstream. Thanks for notifying me about this question!
tl;dr
You can use aiosfstream to subscribe and listen for platform events, but you can't use it for publishing.
To ...
- 66
5
votes
Cannot subscribe to platform events using cometd
There are some Salesforce Docs on Subscribe to and Replay Events Using a Visualforce Page. They seem like a good place to start.
Here I'll replicate that example, except from sfdx.
sfdx force:...
- 103k
5
votes
Accepted
Platform Event stuck in OPERATION_ENQUEUED status?
This isn't a complete answer, because it doesn't solve your issue. But I wanted to explain what you're seeing with that error message.
Even though getErrors returns an error, that "error" is ...
- 1,288
4
votes
Accepted
Consuming platform events on AWS
This use case is addressed in the following Amazon AppFlow Trailhead module
Basically you configure AppFlow to subscribe to Salesforce Platform Events and then you can continue your logic in AWS, for ...
- 1,149
4
votes
Unable to subscribe to platform event using emp api
If you view the documentation for lightning:empApi, It only works in Lightning experience or Salesforce mobile.
I try to view your component as VF page or just the App then it fails to load.
then
I ...
- 36.3k
4
votes
Accepted
Subscribe to multiple channels using CometD
As @sfdcfox mentioned in the comments, the new lightning:empApi component can be used to achieve multiple streaming connections in a single component or browser window. I got this working with ...
- 403
4
votes
Accepted
Streaming API in Lightning Component getCallback error
Looks like you have used wrong variable name , happens when you copy paste the code from somewhere else ,
Here is the line that needs to be checked
sessionAction.setCallback(this, function (a) {
...
- 91.7k
4
votes
Accepted
Unable to call Application Event from VF Page
I found out that ConversationReload Event doesn't have access="global" and VF Page from where I was trying to access event was not part of the package.
- 828
4
votes
Accepted
Cometd not working in summer 18
I don't know if this is the right answer but I'm gonna drop the possibility here...
Locker Service defines a few trusted origin domains. Take a look at this commit:
https://github.com/forcedotcom/...
- 11.1k
3
votes
Calling LWC Javascript function from subscribe () method of cometd result in function undefined
As you are using an anonymous function, it will not have access to the this of your component. A this inside that function will refer to the function itself.
To overcome this, you have two options.
1 ...
- 12.2k
3
votes
Publishing an event to Salesforce via CometD
You can't push a message to Salesforce event bus through CometD. From the doc:
Streaming API supports the following CometD methods:
connect The client connects to the server.
disconnect The ...
- 7,747
3
votes
"Cannot add property context, object is not extensible" error during CometD handshake in Lightning Component
As sbordet said in the comment above, there was a solution (or at least workaround) given in the question I linked to, that I somehow missed.
Here is the workaround provided by Grekker in that thread:
...
- 91
3
votes
Does Authorization using a OAuth access token work for CometD?
Forget it the HOST in the URL is wrong https://na73.salesforce.com should be used instead of https://na73.lightning.force.com/
- 315
3
votes
Lightning components, CometD - Refused to connect to ... because it violates the following Content Security Policy directive
The Lightning Component framework uses Content Security Policy (CSP),
which is a W3C standard, to control the source of content that can be
loaded on a page. To use third-party APIs that make ...
- 20.3k
2
votes
Initialise streaming client on button click, rather than init
You could just add a bit of code:
<aura:attribute name="streamingEnabled" type="Boolean" default="false" />
<aura:attribute name="streamingLoaded" type="Boolean" default="false" />
<...
- 500k
2
votes
Platform Event for Guest Community User?
If you can spend a full platform license for it, you can. On your community uses Apex callout to log in into SF using Oauth2 flow. Store username-password for callout in Apex/ custom setting. The ...
- 36.3k
2
votes
Publishing an event to Salesforce via CometD
We can publish event to Salesforce EventBus from an external application by making use of API only.
You can use any Salesforce API to create platform events, such as SOAP API, REST API, or Bulk API.
...
- 238
1
vote
Accepted
Streaming API - How do I automatically queue a retry of a failed messages?
Does this help? source https://developer.salesforce.com/docs/atlas.en-us.api_streaming.meta/api_streaming/using_streaming_api_stateless.htm
“In API version 37.0 and later, Streaming API stores events ...
- 1,140
1
vote
Do I need to re initialize longpolling client with new access token on every connection session timeout?
In the case of server timeouts, the client connects again and starts over.
Reference > https://developer.salesforce.com/docs/atlas.en-us.api_streaming.meta/api_streaming/BayeauxProtocolAndCometD.htm
- 43
1
vote
Getting "has established a session, but no BAYEUX_BROWSER cookie present" When Connecting To Platform Events Channel
I am the CometD Project leader but I don't know the details of the SalesForce integration, so my answer may or may not apply.
When a CometD client first connects to a CometD server, it sends a ...
- 131
1
vote
Issue with platform event Subscription
Although not a direct solution, I have also had similar issues with the 403::Unknown Client error. What I noticed with the seemingly inconsistent subscriptions was that the error would only occur when ...
- 135
1
vote
How to solve inconsistent 403::Unknown Client error on subscribe when using lightning:empApi
The problem in helper method posted is that it uses the isEmpEnabled function incorrectly.
The isEmpEnabled function returns a promise not a boolean. If this is fixed so that isEmpEnabled is called ...
- 757
1
vote
How to use latest cometd version in Salesforce StreamingAPI
I assume you were setting up the connection cross domain. It appears the streaming API isn't supported.
Since salesforce hasn't setup CORS, the Preflight request will fail and you'll see that cometd ...
- 10.2k
1
vote
Subscribe Salesforce without using EMP Connector
You can't currently1. The Bayeux protocal via CometD is the only push technology currently supported by Salesforce for the Streaming API.
From Bayeux Protocol, CometD, and Long Polling:
Long ...
- 103k
1
vote
Need some more information on Salesforce Streaming API
[Disclaimer, I'm the CometD lead, so I can answer about CometD - what SalesForce uses may be slightly different although for this particular question I think the answer below holds for SalesForce too]
...
- 131
Only top scored, non community-wiki answers of a minimum length are eligible