解决 macOS 10.12 下 PAC 模式下Safari 或 Twitter 客户端 tweetbot客户端不能FQ的问题

解决 macOS 10.12 下 PAC 模式下Safari 或 Twitter 客户端 tweetbot客户端不能FQ的问题
https://github.com/qiuyuzhou/ShadowsocksX-NG/issues/30
PS 手头没有 macOS 10.12 的机器，麻烦有的请帮忙测试一下
或者可以从 https://github.com/qinyuhang/ShadowsocksX-NG/tree/webserver 下载去
Xcode build 一下

Pods/GCDWebServer/GCDWebServer/Core/GCDWebServerResponse.h

@@ -0,0 +1,208 @@
+/*
+ Copyright (c) 2012-2015, Pierre-Olivier Latour
+ All rights reserved.
+ 
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+ * The name of Pierre-Olivier Latour may not be used to endorse
+ or promote products derived from this software without specific
+ prior written permission.
+ 
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL PIERRE-OLIVIER LATOUR BE LIABLE FOR ANY
+ DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import <Foundation/Foundation.h>
+
+/**
+ *  The GCDWebServerBodyReaderCompletionBlock is passed by GCDWebServer to the
+ *  GCDWebServerBodyReader object when reading data from it asynchronously.
+ */
+typedef void (^GCDWebServerBodyReaderCompletionBlock)(NSData* data, NSError* error);
+
+/**
+ *  This protocol is used by the GCDWebServerConnection to communicate with
+ *  the GCDWebServerResponse and read the HTTP body data to send.
+ *
+ *  Note that multiple GCDWebServerBodyReader objects can be chained together
+ *  internally e.g. to automatically apply gzip encoding to the content before
+ *  passing it on to the GCDWebServerResponse.
+ *
+ *  @warning These methods can be called on any GCD thread.
+ */
+@protocol GCDWebServerBodyReader <NSObject>
+
+@required
+
+/**
+ *  This method is called before any body data is sent.
+ *
+ *  It should return YES on success or NO on failure and set the "error" argument
+ *  which is guaranteed to be non-NULL.
+ */
+- (BOOL)open:(NSError**)error;
+
+/**
+ *  This method is called whenever body data is sent.
+ *
+ *  It should return a non-empty NSData if there is body data available,
+ *  or an empty NSData there is no more body data, or nil on error and set
+ *  the "error" argument which is guaranteed to be non-NULL.
+ */
+- (NSData*)readData:(NSError**)error;
+
+/**
+ *  This method is called after all body data has been sent.
+ */
+- (void)close;
+
+@optional
+
+/**
+ *  If this method is implemented, it will be preferred over -readData:.
+ *
+ *  It must call the passed block when data is available, passing a non-empty
+ *  NSData if there is body data available, or an empty NSData there is no more
+ *  body data, or nil on error and pass an NSError along.
+ */
+- (void)asyncReadDataWithCompletion:(GCDWebServerBodyReaderCompletionBlock)block;
+
+@end
+
+/**
+ *  The GCDWebServerResponse class is used to wrap a single HTTP response.
+ *  It is instantiated by the handler of the GCDWebServer that handled the request.
+ *  If a body is present, the methods from the GCDWebServerBodyReader protocol
+ *  will be called by the GCDWebServerConnection to send it.
+ *
+ *  The default implementation of the GCDWebServerBodyReader protocol
+ *  on the class simply returns an empty body.
+ *
+ *  @warning GCDWebServerResponse instances can be created and used on any GCD thread.
+ */
+@interface GCDWebServerResponse : NSObject <GCDWebServerBodyReader>
+
+/**
+ *  Sets the content type for the body of the response.
+ *
+ *  The default value is nil i.e. the response has no body.
+ *
+ *  @warning This property must be set if a body is present.
+ */
+@property(nonatomic, copy) NSString* contentType;
+
+/**
+ *  Sets the content length for the body of the response. If a body is present
+ *  but this property is set to "NSUIntegerMax", this means the length of the body
+ *  cannot be known ahead of time. Chunked transfer encoding will be
+ *  automatically enabled by the GCDWebServerConnection to comply with HTTP/1.1
+ *  specifications.
+ *
+ *  The default value is "NSUIntegerMax" i.e. the response has no body or its length
+ *  is undefined.
+ */
+@property(nonatomic) NSUInteger contentLength;
+
+/**
+ *  Sets the HTTP status code for the response.
+ *
+ *  The default value is 200 i.e. "OK".
+ */
+@property(nonatomic) NSInteger statusCode;
+
+/**
+ *  Sets the caching hint for the response using the "Cache-Control" header.
+ *  This value is expressed in seconds.
+ *
+ *  The default value is 0 i.e. "no-cache".
+ */
+@property(nonatomic) NSUInteger cacheControlMaxAge;
+
+/**
+ *  Sets the last modified date for the response using the "Last-Modified" header.
+ *
+ *  The default value is nil.
+ */
+@property(nonatomic, retain) NSDate* lastModifiedDate;
+
+/**
+ *  Sets the ETag for the response using the "ETag" header.
+ *
+ *  The default value is nil.
+ */
+@property(nonatomic, copy) NSString* eTag;
+
+/**
+ *  Enables gzip encoding for the response body.
+ *
+ *  The default value is NO.
+ *
+ *  @warning Enabling gzip encoding will remove any "Content-Length" header
+ *  since the length of the body is not known anymore. The client will still
+ *  be able to determine the body length when connection is closed per
+ *  HTTP/1.1 specifications.
+ */
+@property(nonatomic, getter=isGZipContentEncodingEnabled) BOOL gzipContentEncodingEnabled;
+
+/**
+ *  Creates an empty response.
+ */
++ (instancetype)response;
+
+/**
+ *  This method is the designated initializer for the class.
+ */
+- (instancetype)init;
+
+/**
+ *  Sets an additional HTTP header on the response.
+ *  Pass a nil value to remove an additional header.
+ *
+ *  @warning Do not attempt to override the primary headers used
+ *  by GCDWebServerResponse like "Content-Type", "ETag", etc...
+ */
+- (void)setValue:(NSString*)value forAdditionalHeader:(NSString*)header;
+
+/**
+ *  Convenience method that checks if the contentType property is defined.
+ */
+- (BOOL)hasBody;
+
+@end
+
+@interface GCDWebServerResponse (Extensions)
+
+/**
+ *  Creates a empty response with a specific HTTP status code.
+ */
++ (instancetype)responseWithStatusCode:(NSInteger)statusCode;
+
+/**
+ *  Creates an HTTP redirect response to a new URL.
+ */
++ (instancetype)responseWithRedirect:(NSURL*)location permanent:(BOOL)permanent;
+
+/**
+ *  Initializes an empty response with a specific HTTP status code.
+ */
+- (instancetype)initWithStatusCode:(NSInteger)statusCode;
+
+/**
+ *  Initializes an HTTP redirect response to a new URL.
+ */
+- (instancetype)initWithRedirect:(NSURL*)location permanent:(BOOL)permanent;
+
+@end