To get around this, and be able to manage dead connections we need a customized strategy implementation and build it into the HttpClient.Įxample 5.1. This page contains Fake Online REST API for the testing purposes which are performing various CRUD operations.
#Apache http client how to#
reference: “ If the Keep-Alive header is not present in the response, HttpClient assumes the connection can be kept alive indefinitely.” ( See the HttpClient Reference). How to send POST request with JSON using Apache HttpClient In this tutorial, we will test the ‘Dummy Sample Rest API’ which is available here. Let's take a look at the logs – we have three threads running but only 2 leased connections: INFO o.b.h.c.MultiHttpClientConnThread So, in this example, we're trying to have 3 threads make 3 requests to the same host, but only 2 connections will be allocated in parallel. = new MultiHttpClientConnThread(client, get) Īs we've already discussed, the per host connection limit is 2 by default. SetConnectionManager(connManager).build() Using Threads to Execute Connections HttpGet get = new HttpGet("") ĬloseableHttpClient client = HttpClients.custom(). So, without changing the default, we're going to reach the limits of the connection manager quite easily – let's see how that looks like:Įxample 4.2. setMaxPerRoute(int max): Set the total number of concurrent connections to a specific route, which is 2 by default.setDefaultMaxPerRoute(int max): Set the maximum number of concurrent connections per route, which is 2 by default.
Using Two HttpClients to Connect to One Target Host Each HttpGet get1 = new HttpGet("/") Next – let's see how the same connection manager can be used by two HttpClients running in two different threads:Įxample 3.2. = HttpClients.custom().setConnectionManager(poolingConnManager)ĪssertTrue(poolingConnManager.getTotalStats().getLeased() = 1) = new PoolingHttpClientConnectionManager() Setting the PoolingHttpClientConnectionManager on a HttpClient HttpClientConnectionManager poolingConnManager First – let's take a look at how to set up this connection manager on a simple HttpClient:Įxample 3.1.
The default size of the pool of concurrent connections that can be open by the manager is 2 for each route or target host, and 20 for total open connections. The PoolingHttpClientConnectionManager will create and manage a pool of connections for each route or target host we use.
0 kommentar(er)
