Add local port binding to HTTPClient.Configuration - #914
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Adds a `localPort: Int` knob on `HTTPClient.Configuration` that pins the TCP source port the connection binds to before connecting, plus a per-request `HTTPClientRequest.localPort` override. `0` (the default) keeps the previous behaviour of letting the OS assign an ephemeral port. `localPort` is threaded through `RequestOptions` and `ConnectionPool.Key` alongside the existing `localAddress`, so connections with different `(localAddress, localPort)` pairs are pooled separately. Both the NIOTS (`requiredLocalEndpoint`) and NIOPosix (`bind(to:)`) bootstraps in the plain and TLS paths honour it.
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Adds a
localPort: Intknob onHTTPClient.Configurationthat pins the TCP source port the connection binds to before connecting, plus a per-requestHTTPClientRequest.localPortoverride.0(the default) keeps the previous behaviour of letting the OS assign an ephemeral port.localPortis threaded throughRequestOptionsandConnectionPool.Keyalongside the existinglocalAddress, so connections with different(localAddress, localPort)pairs are pooled separately. Both the NIOTS (requiredLocalEndpoint) and NIOPosix (bind(to:)) bootstraps in the plain and TLS paths honour it.