address may also share the same underlying TCP socket connection. Sharing a connection has substantial performance benefits: lower latency, higher throughput (due to [TCP slow start](https://www.igvita.com/2011/10/20/faster-web-vs-tcp-slow-start/)) and conserved battery. OkHttp uses a [ConnectionPool](https://square.github.io/okhttp/5.x/okhttp/okhttp3/-connection-pool/) that automatically reuses HTTP/1.x connections and multiplexes HTTP/2 connections.

In OkHttp some fields of the address come...

### Cache Hit

In the ideal scenario the cache can fulfill the request without any conditional call to the network.
This will skip the normal events such as DNS, connecting to the network, and downloading the response body.

As recommended by the HTTP RFC the max age of a document is defaulted to 10% of the

If code depends on buggy (including insecure) behavior,
then fixing the bug will break that code.
New features can also have similar impacts:
enabling the HTTP/2 use by the HTTP client broke programs
connecting to servers with buggy HTTP/2 implementations.
These kinds of changes are unavoidable and
[permitted by the Go 1 compatibility rules](/doc/go1compat).
Even so, Go provides a mechanism called GODEBUG to

- github.com/davecgh/go-spew: [v1.1.1 → d8f796a](https://github.com/davecgh/go-spew/compare/v1.1.1...d8f796a)
- github.com/docker/go-connections: [v0.5.0 → v0.6.0](https://github.com/docker/go-connections/compare/v0.5.0...v0.6.0)
- github.com/emicklei/go-restful/v3: [v3.12.2 → v3.13.0](https://github.com/emicklei/go-restful/compare/v3.12.2...v3.13.0)

          // This request will share a connection with 'A' cause it's all done.
          client.newCall(Request.Builder().url(server.url("/b")).build()).enqueue(callback)
        }
      },
    )
    callback.await(server.url("/b")).assertCode(200).assertBody("def")
    // New connection.
    assertThat(server.takeRequest().exchangeIndex).isEqualTo(0)
    // Connection reuse!

            } else {
                logger.warn("Invalid index config name: configName={}", configName);
            }
        });
    }

    /**
     * Creates an HTTP client for connecting to the search engine.
     *
     * @param fessConfig the Fess configuration
     * @param host       the search engine host address
     * @return the configured HTTP client
     */

    .url("https://publicobject.com/helloworld.txt")
    .build();

System.out.println("REQUEST 1 (new connection)");
try (Response response = client.newCall(request).execute()) {
  // Consume and discard the response body.
  response.body().source().readByteString();
}

System.out.println("REQUEST 2 (pooled connection)");
try (Response response = client.newCall(request).execute()) {
  // Consume and discard the response body.

closed, up to a conservative limit, to allow better connection reuse. For most
programs, this change should be a no-op, or result in a performance improvement.
In rare cases, programs that do not benefit from connection reuse might
experience performance degradation if they had been improperly allowing an
excessive amount of idle connections to linger; usually by setting

## Retrying Requests

Sometimes connections fail: either a pooled connection was stale and disconnected, or the webserver itself couldn’t be reached. OkHttp will retry the request with a different route if one is available.

## [Calls](https://square.github.io/okhttp/5.x/okhttp/okhttp3/-call/)

	//   isTransaction: Indicates whether this operation is part of a transaction, which may affect the caching strategy.
	//   connPool: A connection pool that provides database connections.
	//   locker: A synchronization lock that is unlocked after initialization to avoid deadlocks.
	// Returns:
	//   *Stmt: A newly created statement object for executing SQL operations.