What is the use of PoolingHttpClientConnectionManager?

PoolingHttpClientConnectionManager is a more complex implementation that manages a pool of client connections and is able to service connection requests from multiple execution threads. Connections are pooled on a per route basis.

What is setMaxPerRoute?

setMaxPerRoute(int max): Set the total number of concurrent connections to a specific route, which is 2 by default.

What is CloseableHttpClient?

CloseableHttpClient is the base class of the httpclient library, the one all implementations use. Other subclasses are for the most part deprecated. The HttpClient is an interface for this class and other classes. You should then use the CloseableHttpClient in your code, and create it using the HttpClientBuilder .

How do I monitor HTTP connection pool?

Go to Monitoring and Tuning > Performance Viewer > Current activity , select server, then in PMI viewer select Settings > Log to define logging period and format. And in Modules > Thread pools > WebContainer you can view current counter values. This is rather for short term monitoring, than for constant logging.

What is HttpClient connection pool?

What is Connection Pooling? The SocketsHttpHandler establishes a pool of connections for each unique endpoint which your application makes an outbound HTTP request to via HttpClient.

What is connectionRequestTimeout?

connectionRequestTimeout time to wait for getting a connection from the connection manager/pool. ( HttpClient maintains a connection pool to manage the connections.

What is SSLConnectionSocketFactory?

SSLConnectionSocketFactory is a layered socket factory for TSL and SSL connections. Using this, you can verify the Https server using a list of trusted certificates and authenticate the given Https server. You can create this in many ways.

What is HttpComponentsClientHttpRequestFactory?

HttpComponentsClientHttpRequestFactory is ClientHttpRequestFactory implementation that uses Apache HttpComponents HttpClient to create requests. We have used @Scheduled annotation in httpClient configuration. To support this, we have to add support of scheduled execution of thread.

How do I make CloseableHttpClient?

Create instance of CloseableHttpClient using helper class HttpClients . Create HttpGet or HttpPost instance based on the HTTP request type. Use addHeader method to add required headers such as User-Agent, Accept-Encoding etc. For POST, create list of NameValuePair and add all the form parameters.

What is connection pooling and why it is used?

Connection pooling means that connections are reused rather than created each time a connection is requested. To facilitate connection reuse, a memory cache of database connections, called a connection pool, is maintained by a connection pooling module as a layer on top of any standard JDBC driver product.

Do I need to close HttpClient?

You do not need to explicitly close the HttpClient, however, (you may be doing this already but worth noting) you should ensure that connections are released after method execution. Edit: The ClientConnectionManager within the HttpClient is going to be responsible for maintaining the state of connections.