Api Testing for Api's hosted Locally on my laptop gives me error cannot send test request

The error am getting is that connection refused and when i go to check more details this is the error below

Stack trace: java.net.ConnectException: Connection refused: connect

at java.net.DualStackPlainSocketImpl.connect0(Native Method)

at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)

at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)

at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)

at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)

at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)

at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)

at java.net.Socket.connect(Socket.java:589)

at java.net.Socket.connect(Socket.java:538)

at sun.net.NetworkClient.doConnect(NetworkClient.java:180)

at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)

at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)

at sun.net.www.http.HttpClient.(HttpClient.java:242)

at sun.net.www.http.HttpClient.New(HttpClient.java:339)

at sun.net.www.http.HttpClient.New(HttpClient.java:357)

at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)

at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1199)

at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)

at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)

at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1564)

at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1492)

at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)

at com.kms.katalon.core.webservice.common.RestfulClient.response(RestfulClient.java:170)

at com.kms.katalon.core.webservice.common.RestfulClient.sendGetRequest(RestfulClient.java:79)

at com.kms.katalon.core.webservice.common.RestfulClient.send(RestfulClient.java:48)

at com.kms.katalon.controller.WebServiceController.sendRequest(WebServiceController.java:39)

at com.kms.katalon.composer.webservice.parts.RestServicePart$4.run(RestServicePart.java:152)

at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:119)

)

how can i resolve it

Are you using the correct request URL from your side?