curl send JSON payload - rabbitmq

Question

I'm just strating with RabbitMQ and I try to send a json payload to it. Unfortunately I'm getting error:
{"error":"bad_request","reason":"payload_not_string"}
I read somewhere that I need to use "content_type": "application/json" but that has not helped either.
This is the body I'm trying to send:
{
"properties": {
"delivery_mode": 2,
"content_type": "application/json"
},
"routing_key": "git",
"payload": {
"action": "created",
"comment": {
"url": "https://api.github.com/repos/baxterthehacker/public-repo/comments/11056394",
"id": 11056394
}
},
"payload_encoding": "string"
}
And the full curl:
curl -i -X POST \
-H "Content-Type:application/json" \
-H "Authorization:Basic Z3Vlc3Q6Z3Vlc3Q=" \
-d \
'{
"properties": {
"delivery_mode": 2,
"content_type": "application/json"
},
"routing_key": "git",
"payload": {
"action": "created",
"comment": {
"url": "https://api.github.com/repos/baxterthehacker/public-repo/comments/11056394",
"id": 11056394
}
},
"payload_encoding": "string"
}' \
'http://localhost:8090/api/exchanges/%2f/amq.topic/publish'
Is it possible to send the json payload at all? I was thinking of sending Github webhooks to one of the queues.

Answer 1

The RabbitMQ team monitors this mailing list and only sometimes answers questions on StackOverflow.
The error you see is correct, your payload is not a string. I had to reproduce this and re-visit the HTTP API docs for this to become clear.
The value you are passing to the payload key in your JSON is more JSON - in order for it to be a string, you must escape it correctly and pass it like this:
$ curl -4vvv -u guest:guest -H 'Content-Type: application/json' localhost:15672/api/exchanges/%2f/amq.topic/publish --data-binary '{
"properties": {
"delivery_mode": 2,
"content_type": "application/json"
},
"routing_key": "git",
"payload":"{\"action\":\"created\",\"comment\":{\"url\":\"https://api.github.com/repos/baxterthehacker/public-repo/comments/11056394\",\"id\":11056394}}",
"payload_encoding": "string"
}'
The other alternative is to base-64 encode the JSON from GitHub and pass that as the payload - you won't have to escape anything if you do that.