Add todos

TODO.md

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+# TODOs
+
+## High
+
+- [ ] Fix max requests per second with the C++ client.
+    Maximum requests per second should be *per content*,
+    not *per connection*.
+    If 10 pieces of content are registered per minute
+    and each one is requested immediately,
+    then a request limit of 5 requests per minute makes the connection fail,
+    which is not what should happen.
+- [ ] Add config option to limit how many chunks are buffered on the server.
+- [ ] Add config option to enable TCP keep-alive or not.
+    This should be a choice.
+    If there's a cache in front of it it's e.g. probably a good idea,
+    to keep a connection open between the server and the cache,
+    instead of opening a new connection every time.
+
+## Normal
+
+- [ ] Write tests for heavy load (multiple parallel requests, no caching)
+- [ ] Add proper logging to the C++ client
+    (protobuf, libhv and protocol errors).
+    The client ID should always be logged,
+    this helps a ton with debugging on the server-side.
+    Perhaps also log the Hello message?
+
+## Low
+- [ ] Add a way to clear cached paths for connected clients,
+    so that anything that might be cached on the server can be removed.
+    Just a way to free resources whenever needed.
+    Maybe also add a server option "maximum cached paths per client",
+    if it's ever exceeded the connection is closed.
+- [ ] Add flag in client program to verify a server's certificate.
+- [ ] Change "-server" option in Go client to use the WSS endpoint url.
+- [ ] Wildcard content types are not supported in the server's constraints yet.
+- [ ] Add support for QT websockets to the C++ client,
+    as an alternative to libhv.
+- [ ] Move image resizing into the client library?
+    Might be a good idea, but might also mean additional maintenance
+    that is not really a concern of the client library.
+    Needs discussion.
+- [ ] Add support for JSON protobuf encoding, if the need ever arises
+    (e.g. in a browser implementation)
+    or to generally simplify client implementation.
+- [ ] Add support for rotation between multiple loon servers?