Logstash HTTP output plugin

[mohsin106 (Mohsin)]

I'm trying to use the HTTP output plugin to send a PUT request to a URL but getting a 400 message, and I can't figure out what I'm messing up.
I'm using Logstash v8 running in a Docker container.

I'm able to successfully make a PUT request using Postman App. This is the HTTP code that Postman generates which I'm using to configure the HTTP plugin in Logstash

PUT /v2/conversation/account/accountid1122/sendMessage HTTP/1.1
Host: endpoint.testing.com
Authorization: my auth code
Content-Type: application/json
Content-Length: 257

{
    "recipients": [
        {
            "phone": "+1234567890",
            "firstName": "Test",
            "lastName": "Test"
        }
    ],
    "locationId": "myLocationID",
    "msg": "API Test!",
    "scheduledAt": null
}

My HTTP plugin looks like this:

http {
       http_method => "put"
       url => "https://endpoint.testing.com/v2/conversation/account/accountid1122/sendMessage"
       headers => {
          "Content-Type" => "application/json"
          "Authorization" => "MyAuthCode"
       }
       message => '{
          "recipients": [
              {
                  "phone": "1234567890",
              }
          ],
          "locationId": "myLocationID",
          "msg": "API Test!!",
          "scheduledAt": null
        }'
    }

Logstash is throwing 400 error.

Encountered non-2xx HTTP code 400 {:response_code=>400, :url=>"https://endpoint.testing.com/v2/conversation/account/accountid1122/sendMessage", :event=>#<LogStash::Event:0x76181d9a>

What am I messing up?

[mohsin106 (Mohsin)]

Also, is there a way for me to run the Logstash container with auto-config-reload and debug enabled?

[mohsin106 (Mohsin)]

I got auto-reload and debug working and seeing the following error in the debug logs:

[2023-10-08T13:20:54,205][DEBUG][org.apache.http.wire     ][main][1d48ee448c470bd49a6ba581e5729fb431ff04a6a255fc46a83462d071f31493] http-outgoing-0 << "{"code":400,"message":"Empty value for msg field not allowed"}"

Not sure why I'm getting that even though my msg field is set to "msg": "API Test!!"

[mohsin106 (Mohsin)]

I've also added format => "message" in my HTTP output plugin

[mohsin106 (Mohsin)]

Able to figure out the issue. Just needed to remove "Content-Type" => "application/json" from the headers parameter and set the content_type parameter separately.

Working config:

http {
        http_method => "put"
        url => "https://endpoint.testing.com/v2/conversation/account/accountid1122/sendMessage"
        headers => { "Authorization" => "MyAuthCode"}
        format => "message"
        content_type => "application/json"
        message => '{"msg":"API Test!!","recipients":[{"phone":"%{from}"}],"locationId":"myLocationID","scheduledAt":null}'
      }

Otherwise there were \r\n characters being inserted into the headers which was throwing off the put request.