apigatewaymanagementapi :GetConnection returns “No method found matching route @connections/ for http method GET”

[hadils]

Dependencies

             com.cognitect.aws/api                         {:mvn/version "0.8.536"}
             com.cognitect.aws/endpoints                   {:mvn/version "1.1.12.110"}
             com.cognitect.aws/ssm                         {:mvn/version "814.2.1028.0"}
             com.cognitect.aws/sns                         {:mvn/version "811.2.959.0"}
             com.cognitect.aws/cognito-idp                 {:mvn/version "811.2.958.0"}
             com.cognitect.aws/location                    {:mvn/version "814.2.1008.0", :aws/serviceFullName "Amazon Location Service"},
             com.cognitect.aws/s3                          {:mvn/version "814.2.991.0"}
             com.cognitect.aws/apigatewayv2                {:mvn/version "813.2.972.0"}
             com.cognitect.aws/apigatewaymanagementapi     {:mvn/version "770.2.568.0"}

             org.clojure/clojure                           {:mvn/version "1.10.3"}

Description with failing test case

I have defined

(def apipost (aws/client
               {:api                  :apigatewaymanagementapi
                :region               "us-west-2"
                :endpoint-override    {:hostname host
                                       :path     (str "/" stage "/@connections/")}}))

Important: Please include a complete minimal code example that we
can paste as/is into a REPL, execute, and watch fail.

I am using AWS Lambda functions to connect to a Websocket API. Here is the text from the AWS Technical support case:

I did some research and to replicate the issue I followed the below steps:

1. I created a WebSocket API and integrated a Lambda Function with the ‘$connect’ method, which printed the connectionId. I obtained connectionId from CloudWatch logs.

2. Then I started a connection using wscat utility as below :
   $ wscat -c wss://someapi.execute-api.ap-south-1.amazonaws.com/production
   Connected (press CTRL+C to quit)

3. Made a GET request to the the connection URL to get the status of the connectionId. I used ‘awscurl’ utility to test this as below:
   $ awscurl --service execute-api -X GET https://someapi.execute-api.ap-south-1.amazonaws.com/production/@connections/KSIqme0vBcwCG-g=
   I got response in below format for this request:
   {
   {
   "identity" : {
   "sourceIp" : "X.X.X.X",
   "userAgent" : null
   },
   "connectedAt" : "2021-12-13T10:33:26.844Z",
   "lastActiveAt" : "2021-12-13T10:33:26.844Z"
   }

4. However, when I removed the ‘connectionId’ from the end of URL used above and made the request
   $ awscurl --service execute-api -X GET https://someapi.execute-api.ap-south-1.amazonaws.com/production/@connections/
   I received same error as yours i.e.
   {"message":"No method found matching route @connections/ for http method GET."}

To summarize, the URL needs to have connectionId at the end in order to check status of that specific connectionId using GET request.

The :GetConnection invocation is:

(aws/invoke apipost {:op      :GetConnection
                                             :request {:ConnectionId connection-id}})

where. connection-id is a valid ConnectionId taken from the Lambda input.