Spring WebClient Connection Refused Error - spring

Question

When I'm trying to send POST request with WebClient, I get the following error.However if I try to send the request to the same uri using postman it is successful.Please help me out on this I am stuck in this issue and I am new to Spring WebFlux.
threw exception [Request processing failed; nested exception is reactor.core.Exceptions$ReactiveException: io.netty.channel.AbstractChannel$AnnotatedConnectException: finishConnect(..) failed: Connection refused: localhost/127.0.0.1:8080] with root cause\n+ Throwable: java.net.ConnectException: finishConnect(..) failed: Connection refused\n at io.netty.channel.unix.Errors.throwConnectException(Errors.java:124)\n at io.netty.channel.unix.Socket.finishConnect(Socket.java:243)\n at io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe.doFinishConnect(AbstractEpollChannel.java:672)\n at io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe.finishConnect(AbstractEpollChannel.java:649)\n at io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe.epollOutReady(AbstractEpollChannel.java:529)\n at
My WebClient Code to Send Post Req:
String success =
webClient
.post()
.uri("/sendRequest")
.contentType(MediaType.APPLICATION_JSON)
.accept(MediaType.APPLICATION_JSON)
.headers(
httpHeaders -> {
httpHeaders.add(
headerName, headerValue);
})
.body(Mono.just(messageBody), String.class)
.exchange()
.flatMap(
response -> {
HttpStatus httpStatus = response.statusCode();
if (httpStatus.is2xxSuccessful()) {
System.out.println("Message posted");
} else {
System.err.println("Message FAILED. Status=" + httpStatus.toString());
}
return response.bodyToMono(String.class);
})
.block();
}
//My WebClient Builder Code:
public WebClient getWebClient() {
return WebClient.builder().baseUrl(this.MyUrl()).build();
}