使用CFReadStreamCreateForHTTPRequest 截取网络请求，无果！

```objc
@implementation UIViewController (Hook1)
+ (void)load {
struct rebinding _request_binding = { "CFReadStreamCreateForHTTPRequest", wt_CFReadStreamCreateForHTTPRequest, (void *)&original_CFReadStreamCreateForHTTPRequest};

struct rebinding rebs[]={_request_binding};
rebind_symbols(rebs, 1);
}

static CFReadStreamRef
wt_CFReadStreamCreateForHTTPRequest(CFAllocatorRef __nullable alloc, CFHTTPMessageRef request);
CFReadStreamRef wt_CFReadStreamCreateForHTTPRequest(CFAllocatorRef __nullable alloc, CFHTTPMessageRef request) {

NSURL *url = (__bridge NSURL *)CFHTTPMessageCopyRequestURL(request);
NSString *method = (__bridge NSString *)CFHTTPMessageCopyRequestMethod(request);

CFReadStreamRef readStream = original_CFReadStreamCreateForHTTPRequest(alloc, request);

return readStream;
}

static CFReadStreamRef (*original_CFReadStreamCreateForHTTPRequest)(CFAllocatorRef, CFHTTPMessageRef);
@end
```
我想监控 CFNetwork 返回的结果，但是我不能收到返回结果，我使用的是 AFNetworking 做网络请求，但是我没能得到结果，请帮我指点一下，到底是哪里不对，难道一定要使用自己封装的 CFNetwork 请求网络才可以拿到交换的信息吗，我感觉只要底层是使用的 cfnetwork 作为请求底层应该就可以拿到信息，请帮忙看看是不是我哪里使用的不当导致的，谢谢。