crash

[RichAPMIOS]

use an NSURLProtocol subclass to intercept the HTTP/HTTPS requests，then i save http request use model,model has a nettype property.

- (NSString *)netType {
    
    Reachability *reachability = [Reachability reachabilityForInternetConnection];
    [reachability startNotifier];
    NetworkStatus status = [reachability currentReachabilityStatus];
    
    if(status == NotReachable)
    {
        return InfoUnknown;
        //No internet
    }
    else if (status == ReachableViaWiFi)
    {
        return @"wifi";
        //WiFi
    }else if (status == ReachableViaWWAN) {
    
        NSArray *typeStrings2G = @[CTRadioAccessTechnologyEdge,
                                   CTRadioAccessTechnologyGPRS,
                                   CTRadioAccessTechnologyCDMA1x];
        
        NSArray *typeStrings3G = @[CTRadioAccessTechnologyHSDPA,
                                   CTRadioAccessTechnologyWCDMA,
                                   CTRadioAccessTechnologyHSUPA,
                                   CTRadioAccessTechnologyCDMAEVDORev0,
                                   CTRadioAccessTechnologyCDMAEVDORevA,
                                   CTRadioAccessTechnologyCDMAEVDORevB,
                                   CTRadioAccessTechnologyeHRPD];
        
        NSArray *typeStrings4G = @[CTRadioAccessTechnologyLTE];
        
        if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0)
        {
            CTTelephonyNetworkInfo *teleInfo= [[CTTelephonyNetworkInfo alloc] init];
            NSString *accessString = teleInfo.currentRadioAccessTechnology;
            if ([typeStrings4G containsObject:accessString]) {
                return @"4g";
            } else if ([typeStrings3G containsObject:accessString]) {
                return @"3g";
            } else if ([typeStrings2G containsObject:accessString]) {
                return @"2g";
            } else {
                return InfoUnknown;
            }
        } ;
        return InfoUnknown;
    
        
     }
    return InfoUnknown;
}

occasionally crash

Browser(10599,0x700005871000) malloc: *** error for object 0x7fd292e4bfd8: incorrect checksum for freed object - object was probably modified after being freed.
*** set a breakpoint in malloc_error_break to debug
(lldb) bt
* thread #19: tid = 0x5ea3f, 0x00000001106d4bf7 libsystem_malloc.dylib`malloc_error_break, name = 'com.apple.CFNetwork.CustomProtocols', stop reason = breakpoint 2.1
    frame #0: 0x00000001106d4bf7 libsystem_malloc.dylib`malloc_error_break
    frame #1: 0x00000001106cd515 libsystem_malloc.dylib`szone_error + 406
    frame #2: 0x00000001106defe4 libsystem_malloc.dylib`tiny_malloc_from_free_list + 1148
    frame #3: 0x00000001106cdfbb libsystem_malloc.dylib`szone_malloc_should_clear + 497
    frame #4: 0x00000001106d5d3f libsystem_malloc.dylib`malloc_zone_calloc + 87
    frame #5: 0x00000001106d60f8 libsystem_malloc.dylib`calloc + 30
    frame #6: 0x0000000109471340 libobjc.A.dylib`class_createInstance + 85
    frame #7: 0x00000001104b29de libdispatch.dylib`_os_object_alloc + 60
    frame #8: 0x00000001106fddef libsystem_network.dylib`nw_parameters_copy_inner + 58
    frame #9: 0x0000000110715b48 libsystem_network.dylib`nw_path_copy_derived_parameters + 37
    frame #10: 0x0000000108c7be31 SystemConfiguration`__SCNetworkReachabilitySetDispatchQueue + 907
    frame #11: 0x0000000108c7c1a6 SystemConfiguration`SCNetworkReachabilitySetDispatchQueue + 107
    frame #12: 0x00000001082aa434 Browser`-[Reachability startNotifier](self=0x0000600001065640, _cmd="startNotifier") + 340 at Reachability.m:200
  * frame #13: 0x00000001082b29b2 Browser`-[DeviceInfo netType](self=0x0000600000033d00, _cmd="netType") + 98 at DeviceInfo.m:234
    frame #14: 0x00000001082f6119 Browser`-[HTTPModel setupExtraData](self=0x000060000038bfc0, _cmd="setupExtraData") + 73 at HTTPModel.m:177
    frame #15: 0x00000001082e4b69 Browser`-[HTTPProtocol startLoading](self=0x000060000049f950, _cmd="startLoading") + 1433 at HTTPProtocol.m:161
    frame #16: 0x000000010c6d41b2 CFNetwork`___ZN16CFURLProtocol_NS28_protocolInterface_startLoadEPK20_CFCachedURLResponse_block_invoke + 307
    frame #17: 0x00000001104b30cd libdispatch.dylib`_dispatch_client_callout + 8
    frame #18: 0x000000011048d9f7 libdispatch.dylib`_dispatch_block_invoke_direct + 567
    frame #19: 0x000000010c5a0eac CFNetwork`RunloopBlockContext::_invoke_block(void const*, void*) + 24
    frame #20: 0x0000000109d74014 CoreFoundation`CFArrayApplyFunction + 68
    frame #21: 0x000000010c5a0da5 CFNetwork`RunloopBlockContext::perform() + 137
    frame #22: 0x000000010c5a0c3e CFNetwork`MultiplexerSource::perform() + 282
    frame #23: 0x000000010c5a0a60 CFNetwork`MultiplexerSource::_perform(void*) + 72
    frame #24: 0x0000000109dc8311 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
    frame #25: 0x0000000109dad59c CoreFoundation`__CFRunLoopDoSources0 + 556
    frame #26: 0x0000000109daca86 CoreFoundation`__CFRunLoopRun + 918
    frame #27: 0x0000000109dac494 CoreFoundation`CFRunLoopRunSpecific + 420
    frame #28: 0x000000010c841082 CFNetwork`_privateRunloopEmulationSet(void*) + 258
    frame #29: 0x000000011085baab libsystem_pthread.dylib`_pthread_body + 180
    frame #30: 0x000000011085b9f7 libsystem_pthread.dylib`_pthread_start + 286
    frame #31: 0x000000011085b1fd libsystem_pthread.dylib`thread_start + 13