Handle error responses that are not json in nature

Some error messages that can comeback from the service can be in non-json
formats.  Malformed URLs are an example of an error that can return this
kind of message.  Instead of assuming all messages are json, instead check
the content-type header and write the raw error message info on toString
for the exception details.

Fixes #53

Author: Peter Nied

onedrivesdk/src/main/java/com/onedrive/sdk/http/DefaultHttpProvider.java

@@ -47,6 +47,16 @@
  */
 public class DefaultHttpProvider implements IHttpProvider {
 
+    /**
+     * The content type header
+     */
+    static final String ContentTypeHeaderName = "Content-Type";
+
+    /**
+     * The content type for json responses
+     */
+    static final String JsonContentType = "application/json";
+
     /**
      * The serializer.
      */
@@ -171,10 +181,8 @@ private <Result, Body> Result sendRequestInternal(final IHttpRequest request,
                                                       final IProgressCallback<Result> progress)
             throws ClientException {
         final int defaultBufferSize = 4096;
-        final String contentTypeHeaderName = "Content-Type";
         final String contentLengthHeaderName = "Content-Length";
         final String binaryContentType = "application/octet-stream";
-        final String jsonContentType = "application/json";
         final int httpClientErrorResponseCode = 400;
         final int httpNoBodyResponseCode = 204;
         final int httpAcceptedResponseCode = 202;
@@ -203,13 +211,13 @@ private <Result, Body> Result sendRequestInternal(final IHttpRequest request,
                 } else if (serializable instanceof byte[]) {
                     mLogger.logDebug("Sending byte[] as request body");
                     bytesToWrite = (byte[]) serializable;
-                    connection.addRequestHeader(contentTypeHeaderName, binaryContentType);
+                    connection.addRequestHeader(ContentTypeHeaderName, binaryContentType);
                     connection.addRequestHeader(contentLengthHeaderName, "" + bytesToWrite.length);
                 } else {
                     mLogger.logDebug("Sending " + serializable.getClass().getName() + " as request body");
                     final String serializeObject = mSerializer.serializeObject(serializable);
                     bytesToWrite = serializeObject.getBytes();
-                    connection.addRequestHeader(contentTypeHeaderName, jsonContentType);
+                    connection.addRequestHeader(ContentTypeHeaderName, JsonContentType);
                     connection.addRequestHeader(contentLengthHeaderName, "" + bytesToWrite.length);
                 }
 
@@ -273,8 +281,8 @@ private <Result, Body> Result sendRequestInternal(final IHttpRequest request,
 
                 final Map<String, String> headers = connection.getHeaders();
 
-                final String contentType = headers.get(contentTypeHeaderName);
-                if (contentType.contains(jsonContentType)) {
+                final String contentType = headers.get(ContentTypeHeaderName);
+                if (contentType.contains(JsonContentType)) {
                     mLogger.logDebug("Response json");
                     return handleJsonResponse(in, resultClass);
                 } else {

onedrivesdk/src/main/java/com/onedrive/sdk/http/OneDriveServiceException.java

@@ -216,6 +216,7 @@ public String getMessage(final boolean verbose) {
                 sb.append(jsonObject.toString(INDENT_SPACES)).append(NEW_LINE);
             } catch (final JSONException ignored) {
                 sb.append("[Warning: Unable to parse error message body]").append(NEW_LINE);
+                sb.append(mError.rawObject.toString()).append(NEW_LINE);
             }
         } else {
             sb.append(TRUNCATION_MARKER).append(NEW_LINE).append(NEW_LINE);
@@ -296,16 +297,26 @@ public static <T> OneDriveServiceException createFromConnection(final IHttpReque
 
         final String responseMessage = connection.getResponseMessage();
         final String rawOutput = DefaultHttpProvider.streamToString(connection.getInputStream());
-        OneDriveErrorResponse error;
-        try {
-            error = serializer.deserializeObject(rawOutput, OneDriveErrorResponse.class);
-        } catch (final Exception ex) {
+        OneDriveErrorResponse error = null;
+        Exception parsingException = null;
+
+        if (headers.get(DefaultHttpProvider.ContentTypeHeaderName).contains(DefaultHttpProvider.JsonContentType)) {
+            try {
+                error = serializer.deserializeObject(rawOutput, OneDriveErrorResponse.class);
+            } catch (final Exception ex) {
+                parsingException = ex;
+            }
+        }
+
+        if (error == null) {
             error = new OneDriveErrorResponse();
             error.error = new OneDriveError();
             error.error.code = "Unable to parse error response message";
             error.error.message = "Raw error: " + rawOutput;
-            error.error.innererror = new OneDriveInnerError();
-            error.error.innererror.code = ex.getMessage();
+            if (parsingException != null) {
+                error.error.innererror = new OneDriveInnerError();
+                error.error.innererror.code = parsingException.getMessage();
+            }
         }
 
         if (responseCode == INTERNAL_SERVER_ERROR) {