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diff --git a/Firebase/Utilities/Network/Private/GULNetworkLoggerProtocol.h b/Firebase/Utilities/Network/Private/GULNetworkLoggerProtocol.h
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+++ b/Firebase/Utilities/Network/Private/GULNetworkLoggerProtocol.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/Foundation.h>
+
+#import <GoogleUtilities/GULLoggerLevel.h>
+
+#import "GULNetworkMessageCode.h"
+
+/// The log levels used by GULNetworkLogger.
+typedef NS_ENUM(NSInteger, GULNetworkLogLevel) {
+  kGULNetworkLogLevelError = GULLoggerLevelError,
+  kGULNetworkLogLevelWarning = GULLoggerLevelWarning,
+  kGULNetworkLogLevelInfo = GULLoggerLevelInfo,
+  kGULNetworkLogLevelDebug = GULLoggerLevelDebug,
+};
+
+@protocol GULNetworkLoggerDelegate <NSObject>
+
+@required
+/// Tells the delegate to log a message with an array of contexts and the log level.
+- (void)GULNetwork_logWithLevel:(GULNetworkLogLevel)logLevel
+                    messageCode:(GULNetworkMessageCode)messageCode
+                        message:(NSString *)message
+                       contexts:(NSArray *)contexts;
+
+/// Tells the delegate to log a message with a context and the log level.
+- (void)GULNetwork_logWithLevel:(GULNetworkLogLevel)logLevel
+                    messageCode:(GULNetworkMessageCode)messageCode
+                        message:(NSString *)message
+                        context:(id)context;
+
+/// Tells the delegate to log a message with the log level.
+- (void)GULNetwork_logWithLevel:(GULNetworkLogLevel)logLevel
+                    messageCode:(GULNetworkMessageCode)messageCode
+                        message:(NSString *)message;
+
+@end