How was file exchange in chat — just by POST request or were there large files?

File sharing in chat usually depends on the size of the files and performance requirements.

• If the files are small (e.g., images, documents up to a few megabytes), a simple POST request with multipart/form-data is often used, sending the file directly to the server.

• For larger files (tens of megabytes and more), more advanced methods are employed, such as:

  • Chunked upload, where the file is split into parts and sent sequentially.
  • Using specialized storage services (e.g., cloud storage), where the file is uploaded separately, and a link is shared in the chat.
  • WebSocket or other protocols for streaming transmission.

Thus, depending on the implementation, file sharing could be as simple as a POST request for small files or more complex for larger data volumes.