http protocol

Dubbo http protocol is base on HTTP form and Spring’s HttpInvoker

Features

• Number of connections: multiple connections
• Connection: short connection
• Transmission protocol: HTTP
• Transmission: synchronous transmission
• Serialization: form serialization
• Scope of application: Available browser view, the form or URL can be passed parameters, Temporary files are not supported.
• Applicable scenarios: Services that need to be available to both application and browser

Constraint

• Parameters and return values must be consistent with Bean specifications

Configuration

configure http protocol：

<dubbo:protocol name="http" port="8080" />

configure Jetty Server (default)：

<dubbo:protocol ... server="jetty" />

configure Servlet Bridge Server (recommend)：

<dubbo:protocol ... server="servlet" />

configure DispatcherServlet：

<servlet>
         <servlet-name>dubbo</servlet-name>
         <servlet-class>org.apache.dubbo.remoting.http.servlet.DispatcherServlet</servlet-class>
         <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
         <servlet-name>dubbo</servlet-name>
         <url-pattern>/*</url-pattern>
</servlet-mapping>

Note that if you use servlets to dispatch requests:

• the port of protocol <dubbo:protocol port="8080" /> must same as servlet container’s.
• the context path of protocol <dubbo:protocol contextpath="foo" /> must same as servlet application’s.