[proxy] Fix proxy to be able to re-send request body (#5361)

Fixes #5360

This adds a small cache of the request body to ensure that it can be
re-sent.

TODO: still needs tested
1 file changed
tree: 2110c19c37ab5e79299e2a9ad83a1a6486ff132a
  1. distribution/
  2. docker/
  3. tests/