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diff --git a/Firebase/Core/Private/FIRNetworkConstants.h b/Firebase/Core/Private/FIRNetworkConstants.h
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+++ b/Firebase/Core/Private/FIRNetworkConstants.h
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+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+@import Foundation;
+
+/// Error codes in Firebase Network error domain.
+/// Note: these error codes should never change. It would make it harder to decode the errors if
+/// we inadvertently altered any of these codes in a future SDK version.
+typedef NS_ENUM(NSInteger, FIRNetworkErrorCode) {
+  /// Unknown error.
+  FIRNetworkErrorCodeUnknown = 0,
+  /// Error occurs when the request URL is invalid.
+  FIRErrorCodeNetworkInvalidURL = 1,
+  /// Error occurs when request cannot be constructed.
+  FIRErrorCodeNetworkRequestCreation = 2,
+  /// Error occurs when payload cannot be compressed.
+  FIRErrorCodeNetworkPayloadCompression = 3,
+  /// Error occurs when session task cannot be created.
+  FIRErrorCodeNetworkSessionTaskCreation = 4,
+  /// Error occurs when there is no response.
+  FIRErrorCodeNetworkInvalidResponse = 5
+};
+
+#pragma mark - Network constants
+
+/// The prefix of the ID of the background session.
+extern NSString *const kFIRNetworkBackgroundSessionConfigIDPrefix;
+
+/// The sub directory to store the files of data that is being uploaded in the background.
+extern NSString *const kFIRNetworkApplicationSupportSubdirectory;
+
+/// Name of the temporary directory that stores files for background uploading.
+extern NSString *const kFIRNetworkTempDirectoryName;
+
+/// The period when the temporary uploading file can stay.
+extern const NSTimeInterval kFIRNetworkTempFolderExpireTime;
+
+/// The default network request timeout interval.
+extern const NSTimeInterval kFIRNetworkTimeOutInterval;
+
+/// The host to check the reachability of the network.
+extern NSString *const kFIRNetworkReachabilityHost;
+
+/// The key to get the error context of the UserInfo.
+extern NSString *const kFIRNetworkErrorContext;
+
+#pragma mark - Network Status Code
+
+extern const int kFIRNetworkHTTPStatusOK;
+extern const int kFIRNetworkHTTPStatusNoContent;
+extern const int kFIRNetworkHTTPStatusCodeMultipleChoices;
+extern const int kFIRNetworkHTTPStatusCodeMovedPermanently;
+extern const int kFIRNetworkHTTPStatusCodeFound;
+extern const int kFIRNetworkHTTPStatusCodeNotModified;
+extern const int kFIRNetworkHTTPStatusCodeMovedTemporarily;
+extern const int kFIRNetworkHTTPStatusCodeNotFound;
+extern const int kFIRNetworkHTTPStatusCodeCannotAcceptTraffic;
+extern const int kFIRNetworkHTTPStatusCodeUnavailable;
+
+#pragma mark - Error Domain
+
+extern NSString *const kFIRNetworkErrorDomain;