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HTTP Proxy configuration

If you are behind a proxy and need to configure proxy settings for HTTP outbound adapters or gateways, you can apply one of two approaches. In most cases, you can rely on the standard Java system properties that control the proxy settings. Otherwise, you can explicitly configure a Spring bean for the HTTP client request factory instance.

Standard Java Proxy configuration

You can set three system properties to configure the proxy settings that are used by the HTTP protocol handler:

  • http.proxyHost: The host name of the proxy server.

  • http.proxyPort: The port number (the default is 80).

  • http.nonProxyHosts: A list of hosts that should be reached directly, bypassing the proxy. This is a list of patterns separated by |. The patterns may start or end with a * for wildcards. Any host that matches one of these patterns is reached through a direct connection instead of through a proxy.

For HTTPS, the following properties are available:

  • https.proxyHost: The host name of the proxy server.

  • https.proxyPort: The port number, the default value being 80.

For more information, see docs.oracle.com/javase/8/docs/technotes/guides/net/proxies.html

Spring’s SimpleClientHttpRequestFactory

If you need more explicit control over the proxy configuration, you can use Spring’s SimpleClientHttpRequestFactory and configure its 'proxy' property, as the following example shows:

<bean id="requestFactory"
    class="org.springframework.http.client.SimpleClientHttpRequestFactory">
    <property name="proxy">
        <bean id="proxy" class="java.net.Proxy">
            <constructor-arg>
                <util:constant static-field="java.net.Proxy.Type.HTTP"/>
            </constructor-arg>
            <constructor-arg>
                <bean class="java.net.InetSocketAddress">
                    <constructor-arg value="123.0.0.1"/>
                    <constructor-arg value="8080"/>
                </bean>
            </constructor-arg>
        </bean>
    </property>
</bean>