Fix crash of iOS FlipperNetworkPlugin

iOS/Plugins/FlipperKitNetworkPlugin/SKIOSNetworkPlugin/FLEXNetworkLib/FLEXNetworkObserver.mm

@@ -270,6 +270,14 @@ + (void)injectIntoNSURLSessionTaskResume
         Method originalResume = class_getInstanceMethod(className, selector);
 
         void (^swizzleBlock)(NSURLSessionTask *) = ^(NSURLSessionTask *slf) {
+
+            // iOS's internal HTTP parser finalization code is mysteriously not thread safe,
+            // invoke it asynchronously has a chance to cause a `double free` crash.
+            // This line below will ask for HTTPBody synchronously, make the HTTPParser parse the request and cache them in advance,
+            // After that the HTTPParser will be finalized,
+            // make sure other threads inspecting the request won't trigger a race to finalize the parser.
+            [slf.currentRequest HTTPBody];
+
             [[FLEXNetworkObserver sharedObserver] URLSessionTaskWillResume:slf];
             ((void(*)(id, SEL))objc_msgSend)(slf, swizzledSelector);
         };