Use the String instead of CFNetwork symbol, seems not visible on watchOS ;)

SDWebImage/Core/SDWebImageDownloaderDecryptor.h

@@ -30,7 +30,12 @@ A downloader response modifier class with block.
 */
 @interface SDWebImageDownloaderDecryptor : NSObject <SDWebImageDownloaderDecryptor>
 
+/// Create the data decryptor with block
+/// @param block A block to control decrypt logic
 - (nonnull instancetype)initWithBlock:(nonnull SDWebImageDownloaderDecryptorBlock)block;
+
+/// Create the data decryptor with block
+/// @param block A block to control decrypt logic
 + (nonnull instancetype)decryptorWithBlock:(nonnull SDWebImageDownloaderDecryptorBlock)block;
 
 @end

SDWebImage/Core/SDWebImageDownloaderRequestModifier.h

@@ -29,7 +29,12 @@ typedef NSURLRequest * _Nullable (^SDWebImageDownloaderRequestModifierBlock)(NSU
  */
 @interface SDWebImageDownloaderRequestModifier : NSObject <SDWebImageDownloaderRequestModifier>
 
+/// Create the request modifier with block
+/// @param block A block to control modifier logic
 - (nonnull instancetype)initWithBlock:(nonnull SDWebImageDownloaderRequestModifierBlock)block;
+
+/// Create the request modifier with block
+/// @param block A block to control modifier logic
 + (nonnull instancetype)requestModifierWithBlock:(nonnull SDWebImageDownloaderRequestModifierBlock)block;
 
 @end
@@ -49,6 +54,6 @@ typedef NSURLRequest * _Nullable (^SDWebImageDownloaderRequestModifierBlock)(NSU
 /// @param headers HTTP Headers. Case insensitive according to HTTP/1.1(HTTP/2) standard. The headers will overide the same fileds from original request.
 /// @param body HTTP Body
 /// @note This is for convenience, if you need code to control the logic, use `SDWebImageDownloaderRequestModifier` instead
-- (nonnull instancetype)initWithMethod:(nullable NSString *)method headers:(nullable NSDictionary<NSString *, NSString *> *)headers body:(nullable NSData *)body NS_DESIGNATED_INITIALIZER;
+- (nonnull instancetype)initWithMethod:(nullable NSString *)method headers:(nullable NSDictionary<NSString *, NSString *> *)headers body:(nullable NSData *)body;
 
 @end

SDWebImage/Core/SDWebImageDownloaderResponseModifier.h

@@ -29,7 +29,12 @@ typedef NSURLResponse * _Nullable (^SDWebImageDownloaderResponseModifierBlock)(N
  */
 @interface SDWebImageDownloaderResponseModifier : NSObject <SDWebImageDownloaderResponseModifier>
 
+/// Create the response modifier with block
+/// @param block A block to control modifier logic
 - (nonnull instancetype)initWithBlock:(nonnull SDWebImageDownloaderResponseModifierBlock)block;
+
+/// Create the response modifier with block
+/// @param block A block to control modifier logic
 + (nonnull instancetype)responseModifierWithBlock:(nonnull SDWebImageDownloaderResponseModifierBlock)block;
 
 @end
@@ -49,6 +54,6 @@ typedef NSURLResponse * _Nullable (^SDWebImageDownloaderResponseModifierBlock)(N
 /// @param statusCode HTTP Status Code
 /// @param headers HTTP Headers. Case insensitive according to HTTP/1.1(HTTP/2) standard. The headers will overide the same fileds from original response.
 /// @note This is for convenience, if you need code to control the logic, use `SDWebImageDownloaderResponseModifier` instead
-- (nonnull instancetype)initWithVersion:(nullable NSString *)version statusCode:(NSInteger)statusCode headers:(nullable NSDictionary<NSString *, NSString *> *)headers NS_DESIGNATED_INITIALIZER;
+- (nonnull instancetype)initWithVersion:(nullable NSString *)version statusCode:(NSInteger)statusCode headers:(nullable NSDictionary<NSString *, NSString *> *)headers;
 
 @end

SDWebImage/Core/SDWebImageDownloaderResponseModifier.m

@@ -72,7 +72,7 @@
         NSString *value = self.headers[header];
         mutableHeaders[header] = value;
     }
-    NSHTTPURLResponse *httpResponse = [[NSHTTPURLResponse alloc] initWithURL:response.URL statusCode:self.statusCode HTTPVersion:self.version ?: (__bridge NSString *)kCFHTTPVersion1_1 headerFields:[mutableHeaders copy]];
+    NSHTTPURLResponse *httpResponse = [[NSHTTPURLResponse alloc] initWithURL:response.URL statusCode:self.statusCode HTTPVersion:self.version ?: @"HTTP/1.1" headerFields:[mutableHeaders copy]];
     return httpResponse;
 }