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81023dbf52
Our `socket-factory`-aware HttpClient is currently only able to handle a single request at a time. That is a result of the requirement that we wanted to support connections to different domains but also be able to "self-heal" those connections by establishing a new one if the current one failed. As I am learning more about how connlib's DoH support is going to work, it became apparent that we will only ever need to connect to a single domain per instance of the `HttpClient`. In addition, it is quite important to allow for concurrent requests: We don't want to process DoH queries in sequence but instead make full use of the underlying HTTP2 protocol and send multiple requests in parallel. This PR refactors the `HttpClient` (which isn't in use anywhere yet) to only support a single connection per instance. That connection is established when the instance is created. This is also conceptually easier to understand as we only manage a single connection without mutable state. Related: #4668