gistfile1.m

#import <Foundation/Foundation.h>

@interface MyURLProtocol : NSURLProtocol
+(BOOL)canInitWithRequest:(NSURLRequest *)request;
+(NSURLRequest *)canonicalRequestForRequest:(NSURLRequest *)request;
-(void)startLoading;
-(void)stopLoading;
@end


#import "MyURLProtocol.h"

@implementation MyURLProtocol
+(BOOL)canInitWithRequest:(NSURLRequest *)request {
    if ([[request.URL host] isEqualToString:@"m.yahoo.co.jp"])
        return NO;
    
    NSLog(@"canInitWithRequest: %@", request);
    return YES;
}

+(NSURLRequest *)canonicalRequestForRequest:(NSURLRequest *)request {
    return request;
}

-(void)startLoading {
    NSLog(@"startLoading");
    
    NSLog(@"requested URL: %@", self.request.URL);
       
    NSHTTPURLResponse *response = [[NSHTTPURLResponse alloc] initWithURL:self.request.URL statusCode:200 HTTPVersion:@"1.1" headerFields:[[NSDictionary alloc] init]];
    
    NSData *data = [@"foobar" dataUsingEncoding:NSUTF8StringEncoding];
    
    NSMutableURLRequest *request = self.request.mutableCopy;
    request.URL = [NSURL URLWithString:@"http://m.yahoo.co.jp/"];
    
    NSLog(@"HTTPMethod: %@", [request HTTPMethod]);
    NSLog(@"URL: %@", [request URL]);
    
    //NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://m.yahoo.co.jp/"]];

    [self.client URLProtocol:self wasRedirectedToRequest:request redirectResponse:response];
    [self.client URLProtocol:self didLoadData:data];
    [self.client URLProtocolDidFinishLoading:self];
}

-(void)stopLoading {
    NSLog(@"stopLoading");
}

@end