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问题来自webkit，由于跨域起源请求而阻止了响应。由于我们模拟了响应，因此我们必须强制执行Access-Control-Allow-Origin。
然后，我们还需要强制响应的内容类型。
这是魔术发生的地方：
NSDictionary *headers = @{@"Access-Control-Allow-Origin" : @"*", @"Access-Control-Allow-headers" : @"Content-Type"};
NShttpURLResponse *response = [[NShttpURLResponse alloc] initWithURL:request.URL statusCode:200 httpVersion:@"1.1" headerFIElds:headers];
该协议的最终实现：
#import "EpubProtocol.h"
@implementation EpubProtocol
#pragma mark - NSURLProtocol
+ (BOol)canInitWithRequest:(NSURLRequest *)request {
BOol isAwsRequest = [self request:request contains:@"s3.amazonaws.com"];
return isAwsRequest;
}
+ (NSURLRequest*)canonicalRequestForRequest:(NSURLRequest*)theRequest
{
return theRequest;
}
- (voID)startLoading {
NSURLRequest *request = [self request];
//Mock Amazon call
if([EpubProtocol request:request contains:@"s3.amazonaws.com"]) {
Nsstring *path = [[NSBundle bundleForClass:self.class] pathForResource:@"epub1" ofType:@"Json"];
NSData *data = [NSData dataWithContentsOffile:path];
[self mockRequest:request data:data];
}
}
- (voID)stopLoading
{
NSLog(@"DID stop loading");
}
#pragma mark - Request utils
+ (BOol) request:(NSURLRequest*)request contains:(Nsstring*)domain {
Nsstring *str = [[request URL] absoluteString];
nspredicate *pred = [nspredicate predicateWithFormat:@"SELF contains[cd] %@", domain];
return [pred evaluateWithObject:str];
}
#pragma mark - Mock responses
-(voID) mockRequest:(NSURLRequest*)request data:(NSData*)data {
ID clIEnt = [self clIEnt];
NSDictionary *headers = @{@"Access-Control-Allow-Origin" : @"*", @"Access-Control-Allow-headers" : @"Content-Type"};
NShttpURLResponse *response = [[NShttpURLResponse alloc] initWithURL:request.URL statusCode:200 httpVersion:@"1.1" headerFIElds:headers];
[clIEnt URLProtocol:self dIDReceiveResponse:response
cacheStoragePolicy:NSURLCacheStorageNotAllowed];
[clIEnt URLProtocol:self dIDLoadData:data];
[clIEnt URLProtocolDIDFinishLoading:self];
}
@end
Js没什么特别的：
function loadJsONDoc()
{
var url = "https://s3.amazonaws.com/youboox_recette/epub.Json";
$.AJAX({
url: url,
dataType: 'Json',
ContentType: "application/Json",
success: function(JsonData){
alert('success');
document.getElementByID("mydiv").INNERHTML='<p>'+$.param(JsonData)+'</p>';
},
error: function (request, status, error) {
alert("failure :" + request.status );
}
});
}
我有UIWebview，它可以对外部服务进行AJAX调用。离线时，我需要捕获这些请求并返回本地json。
我实现了NSURLProtocol并设法捕获AJAX请求，问题是jquery始终返回0错误代码：
$.ajax({
url: url,dataType: 'json',contentType: "application/json",success: function(jsonData){
alert("success :");
},error: function (request,status,error) {
alert("failure :" + request.status );
}
}）;
我总是收到一个请求。状态= 0
为了测试我的协议，我尝试在html中模拟图像，并且效果很好。
这是我的完整实现：
#import "EpubProtocol.h"
@implementation EpubProtocol
#pragma mark - NSURLProtocol
+ (BOOL)canInitWithRequest:(NSURLRequest *)request {
BOOL awsRequest = [self request:request contains:@"s3.amazonaws.com"];
BOOL imgRequest = [self request:request contains:@"google.fr"];
BOOL match = awsRequest || imgRequest;
return match;
}
+ (NSURLRequest*)canonicalRequestForRequest:(NSURLRequest*)theRequest
{
return theRequest;
}
- (void)startLoading {
NSURLRequest *request = [self request];
//Mock Amazon call
if([EpubProtocol request:request contains:@"s3.amazonaws.com"]) {
NSString *path = [[NSBundle bundleForClass:self.class] pathForResource:@"epub1" ofType:@"json"];
NSData *data = [NSData dataWithContentsOfFile:path];
[self mockRequest:request mimeType:@"application/json" data:data];
}
//Mock image call
else if([EpubProtocol request:request contains:@"google.fr"]) {
NSOperationQueue *queue = [[NSOperationQueue alloc] init];
[NSURLConnection sendAsynchronousRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.itespresso.fr/wp-content/gallery/yahoo/1-yahoo-logo.jpg"]] queue:queue completionHandler:^(NSURLResponse *response,NSData *data,NSError *error) {
[self mockRequest:request mimeType:@"image/jpeg" data:data];
}];
}
}
- (void)stopLoading
{
NSLog(@"Did stop loading");
}
#pragma mark - Request utils
+ (BOOL) request:(NSURLRequest*)request contains:(NSString*)domain {
NSString *str = [[request URL] absoluteString];
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF contains[cd] %@",domain];
return [pred evaluateWithObject:str];
}
#pragma mark - Mock responses
-(void) mockRequest:(NSURLRequest*)request mimeType:(NSString*)mimeType data:(NSData*)data {
id client = [self client];
NSHTTPURLResponse *response = [[NSHTTPURLResponse alloc] initWithURL:[request URL] MIMEType:mimeType expectedContentLength:-1 textEncodingName:nil];
[client URLProtocol:self didReceiveResponse:response
cacheStoragePolicy:NSURLCacheStorageNotAllowed];
[client URLProtocol:self didLoadData:data];
[client URLProtocolDidFinishLoading:self];
}
@end
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