func (db *DB) Driver() driver.Driver {
	return db.connector.Driver()
}

// ErrConnDone is returned by any operation that is performed on a connection
// that has already been returned to the connection pool.
var ErrConnDone = errors.New("sql: connection is already closed")

// Conn returns a single connection by either opening a new connection
// or returning an existing connection from the connection pool. Conn will

	// Now close the busy connections. This provides a connection for
	// the blocked goroutine and then fills up the idle queue.
	for _, v := range rows {
		v.Close()
	}
	// At this point we give the new connection to DB. This connection is
	// now useless, since the idle queue is full and there are no pending
	// requests. DB should deal with this situation without leaking the
	// connection.
	drv.waitCh <- struct{}{}
	wg.Wait()

this subset. properties: connectionPool: properties: http: description: HTTP connection pool settings. properties: h2UpgradePolicy: description: Specify if http1.1 connection should be upgraded to http2 for the associated destination. enum: - DEFAULT - DO_NOT_UPGRADE - UPGRADE type: string http1MaxPendingReque: description: Maximum number of requests that will be queued while waiting for a ready connection pool connection. format: int32 type: integer http2MaxRequests: description: Maximum number of...

	// address the connection arrived on.
	// The associated value will be of type net.Addr.
	LocalAddrContextKey = &contextKey{"local-addr"}
)

// A conn represents the server side of an HTTP connection.
type conn struct {
	// server is the server on which the connection arrived.
	// Immutable; never nil.
	server *Server

	// cancelCtx cancels the connection-level context.
	cancelCtx context.CancelFunc

Lokhttp3/internal/connection/ExchangeFinder;
Lokhttp3/internal/connection/FastFallbackExchangeFinder;
Lokhttp3/internal/connection/RealCall$AsyncCall;
Lokhttp3/internal/connection/RealCall$CallReference;
Lokhttp3/internal/connection/RealCall$timeout$1;
Lokhttp3/internal/connection/RealCall;
Lokhttp3/internal/connection/RealConnection;
Lokhttp3/internal/connection/RealConnectionPool$cleanupTask$1;
Lokhttp3/internal/connection/RealConnectionPool;

	N      = _N
	Other  = _C // Other/C is the set of Unicode control and special characters, category C.
	C      = _C
	Pc     = _Pc // Pc is the set of Unicode characters in category Pc (Punctuation, connector).
	Pd     = _Pd // Pd is the set of Unicode characters in category Pd (Punctuation, dash).
	Pe     = _Pe // Pe is the set of Unicode characters in category Pe (Punctuation, close).

    val connect1 = server.takeRequest()
    assertThat(connect1.requestLine).isEqualTo("CONNECT android.com:443 HTTP/1.1")
    assertThat(connect1.headers["Proxy-Authorization"]).isNull()
    val connect2 = server.takeRequest()
    assertThat(connect2.requestLine).isEqualTo("CONNECT android.com:443 HTTP/1.1")
    assertThat(connect2.headers["Proxy-Authorization"]).isEqualTo("password")

      )
    assertContent("A", response)
    val connect1 = server.takeRequest()
    assertThat(connect1.requestLine).isEqualTo("CONNECT android.com:443 HTTP/1.1")
    assertThat(connect1.headers["Proxy-Authorization"]).isNull()
    val connect2 = server.takeRequest()
    assertThat(connect2.requestLine).isEqualTo("CONNECT android.com:443 HTTP/1.1")
    assertThat(connect2.headers["Proxy-Authorization"])

// Issues 4677, 18241, and 17844. If we try to reuse a connection that the
// server is in the process of closing, we may end up successfully writing out
// our request (or a portion of our request) only to find a connection error
// when we try to read from (or finish writing to) the socket.
//
// NOTE: we resend a request only if:
//   - we reused a keep-alive connection
//   - we haven't yet received any header data

	// The /foo -> /foo/ redirect applies to CONNECT requests
	// but the path canonicalization does not.
	{"CONNECT", "google.com", "/dir", 301, "/dir/"},
	{"CONNECT", "google.com", "/../search", 404, ""},
	{"CONNECT", "google.com", "/dir/..", 200, "/dir/"},
	{"CONNECT", "google.com", "/dir/..", 200, "/dir/"},
	{"CONNECT", "google.com", "/dir/./file", 200, "/dir/"},
}