characters it escapes. Previously we weren’t percent-encoding commas,
    parens, and other characters.
 *  Fix: Relax `FormEncodingBuilder` to support building empty forms.
 *  Fix: Timeouts throw `SocketTimeoutException`, not `InterruptedIOException`.
 *  Fix: Change `MockWebServer` to use the same logic as OkHttp when determining
    whether an HTTP request permits a body.

import java.net.ProtocolException
import java.net.Proxy
import java.net.ProxySelector
import java.net.ServerSocket
import java.net.Socket
import java.net.SocketAddress
import java.net.SocketException
import java.net.SocketTimeoutException
import java.net.URI
import java.net.URLConnection
import java.net.UnknownHostException
import java.security.KeyStore
import java.security.cert.CertificateException
import java.security.cert.X509Certificate