Add an HttpRequestException type to Java client (#33416)

Author: BrennanConroy

src/SignalR/clients/java/signalr/core/src/main/java/com/microsoft/signalr/HttpRequestException.java

@@ -0,0 +1,32 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+package com.microsoft.signalr;
+
+/**
+ * An exception thrown when an http request fails with an unexpected status code.
+ */
+public class HttpRequestException extends RuntimeException {
+    private static final long serialVersionUID = 1L;
+    private final int statusCode;
+
+    /**
+     * Initializes a new instance of the {@link HttpRequestException} class with a specified error message and http status code.
+     *
+     * @param message The error message that explains the reason for the exception.
+     * @param statusCode The http status code.
+     */
+    public HttpRequestException(String message, int statusCode) {
+        super(message);
+        this.statusCode = statusCode;
+    }
+
+    /**
+     * Gets the status code from an http request.
+     *
+     * @return The status code from an http request.
+     */
+    public int getStatusCode() {
+        return statusCode;
+    }
+}

src/SignalR/clients/java/signalr/core/src/main/java/com/microsoft/signalr/HubConnection.java

@@ -168,8 +168,8 @@ private Single<NegotiateResponse> handleNegotiate(String url, Map<String, String
 
         return httpClient.post(Negotiate.resolveNegotiateUrl(url, this.negotiateVersion), request).map((response) -> {
             if (response.getStatusCode() != 200) {
-                throw new RuntimeException(String.format("Unexpected status code returned from negotiate: %d %s.",
-                        response.getStatusCode(), response.getStatusText()));
+                throw new HttpRequestException(String.format("Unexpected status code returned from negotiate: %d %s.",
+                        response.getStatusCode(), response.getStatusText()), response.getStatusCode());
             }
             JsonReader reader = new JsonReader(new StringReader(new String(response.getContent().array(), StandardCharsets.UTF_8)));
             NegotiateResponse negotiateResponse = new NegotiateResponse(reader);

src/SignalR/clients/java/signalr/test/src/main/java/com/microsoft/signalr/HubConnectionTest.java

@@ -2704,8 +2704,9 @@ public void negotiateSentOnStart() {
                 .withHttpClient(client)
                 .build();
 
-        Exception exception = assertThrows(RuntimeException.class, () -> hubConnection.start().timeout(30, TimeUnit.SECONDS).blockingAwait());
+        HttpRequestException exception = assertThrows(HttpRequestException.class, () -> hubConnection.start().timeout(30, TimeUnit.SECONDS).blockingAwait());
         assertEquals("Unexpected status code returned from negotiate: 404 .", exception.getMessage());
+        assertEquals(404, exception.getStatusCode());
 
         List<HttpRequest> sentRequests = client.getSentRequests();
         assertEquals(1, sentRequests.size());
@@ -3859,9 +3860,10 @@ public void non200FromNegotiateThrowsError() {
                 .withHttpClient(client)
                 .build();
 
-        RuntimeException exception = assertThrows(RuntimeException.class,
+                HttpRequestException exception = assertThrows(HttpRequestException.class,
             () -> hubConnection.start().timeout(30, TimeUnit.SECONDS).blockingAwait());
         assertEquals("Unexpected status code returned from negotiate: 500 Internal server error.", exception.getMessage());
+        assertEquals(500, exception.getStatusCode());
     }
 
     @Test