Added max_buffer_size as a configuration item on the httpservice

[ngrondin]

PR Type

Feature

PR Checklist

• [x] Tests for the changes have been added / updated.
• [x] Documentation comments have been added / updated.
• [ ] A changelog entry has been made for the appropriate packages.
• [x] Format code with the latest stable rustfmt.
• [ ] (Team) Label with affected crates and semver status.

Overview

No breaking changes. This new feature allows the user to configure the max_buffer_size used by the http service dispatcher, rather than rely on a const value. This is important to control the chunk size in streaming scenarios. For example, when streaming images in a multipart/x-mixed-replace, if the images are smaller than the const MAX_BUFFER_SIZE, they will buffer and affect the end-user's refresh rate. With this feature, the user can select a lower max_buffer_size and stream arbitrarily small chunks.