Version: 9.4.20.v20190813 |

Proxy Servlet
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## Proxy Servlet

### Info

- Classname: `org.eclipse.jetty.proxy.ProxyServlet`
- Maven Artifact: org.eclipse.jetty:jetty-proxy
- Javadoc: http://www.eclipse.org/jetty/javadoc/9.4.20.v20190813/org/eclipse/jetty/proxy/ProxyServlet.html

### Usage

An asynchronous servlet that forwards requests to another server either as a standard web reverse proxy (as defined by RFC2616) or as a transparent reverse proxy. Internally it uses the async jetty-client.

To facilitate JMX monitoring, the `HttpClient` instance is set as context attribute, prefixed with the servlet’s name and exposed by the mechanism provided by `ContextHandler.MANAGED_ATTRIBUTES`.

### Init Parameters

The following init parameters may be used to configure the servlet:

hostHeader
  forces the host header to a particular value
viaHost
  the name to use in the Via header: Via: http/1.1 <viaHost>
whiteList
  comma-separated list of allowed proxy hosts
blackList
  comma-separated list of forbidden proxy hosts

In addition, there are a number of init parameters that can be used to configure the `HttpClient` instance used internally for the proxy.

maxThreads
  Default Value: 256 The max number of threads of HttpClient’s Executor
maxConnections
  Default Value: 32768 The max number of connections per destination. RFC 2616 suggests that 2 connections should be opened per each destination, but browsers commonly open 6 or more. If this `HttpClient` is used for load testing, it is common to have only one destination (the server to load test), and it is recommended to set this value to a high value (at least as much as the threads present in the executor).
idleTimeout
  Default Value: 30000 The idle timeout in milliseconds that a connection can be idle, that is without traffic of bytes in either direction.
timeout
  Default Value: 60000 The total timeout in milliseconds for the request/response conversation.
requestBufferSize
  Default Value: 4096 The size of the request buffer the request is written into.
responseBufferSize
  Default Value: 4096 The size of the response buffer the response is written into.

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