UEC++ From Basics to Advanced | M28-009: Handling Streaming Data

This video tackles the most challenging part of the module: processing HTTP streaming data. UE5's streaming response delegate available since 5.3 allows you to receive partial data as it arrives, but requires careful binary data handling and cross-thread coordination. You will implement the streaming delegate binding using FHttpResponseDelegate, create a thread-safe data reception mechanism via FPlatformTask or AsyncTask to marshal data to the game thread, and build a recursive data splitter that separates incoming binary chunks into complete JSON messages. The splitting logic uses SSE protocol conventions, detecting dual newline characters as message boundaries, handling partial messages that span multiple callbacks, and extracting the data payload content after removing the data: prefix. This video demonstrates real-time data processing patterns essential for any streaming feature in Unreal Engine. You will learn how to safely handle cross-thread data with weak pointer checks, buffer incomplete messages across callbacks, and extract individual JSON objects from the UTF-8 byte stream.