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| |
| <h1>HTTP servlet transport</h1> |
| |
| <div class="section"> |
| <h2><a name="Introduction"></a>Introduction</h2> |
| |
| <p> |
| The servlet transport processes HTTP requests received through the servlet |
| container in which Axis2 is deployed. It is different from the other transports |
| because its lifecycle is not managed by Axis2, but by the servlet container. |
| Two things are necessary to enable and configure the servlet transport: |
| </p> |
| |
| <ul> |
| |
| <li> |
| <tt>org.apache.axis2.transport.http.AxisServlet</tt> must be registered |
| and mapped as a servlet in <tt>web.xml</tt>. |
| </li> |
| |
| <li> |
| One or more <tt>org.apache.axis2.transport.http.AxisServletListener</tt> |
| instances must be declared as transport receivers in <tt>axis2.xml</tt>. |
| </li> |
| </ul> |
| |
| <p> |
| It should be noted that the role of <tt>AxisServlet</tt> is not limited to that |
| of an Axis2 transport, but that it provides two additional features: |
| </p> |
| |
| <ul> |
| |
| <li> |
| It starts the Axis2 runtime and sets it up to load the <tt>axis2.xml</tt> |
| configuration as well as the repository from the Web application. |
| </li> |
| |
| <li> |
| It exposes the WSDL documents of deployed services. The WSDL of a service can be |
| accessed by appending <tt>?wsdl</tt> to the EPR of the service. |
| </li> |
| </ul> |
| </div> |
| |
| <div class="section"> |
| <h2><a name="Adding_AxisServlet_to_web.xml"></a>Adding AxisServlet to web.xml</h2> |
| |
| <p> |
| <tt>AxisServlet</tt> is typically configured as follows in <tt>web.xml</tt>: |
| </p> |
| |
| <div> |
| <pre> |
| <servlet> |
| <servlet-name>AxisServlet</servlet-name> |
| <display-name>Apache-Axis Servlet</display-name> |
| <servlet-class>org.apache.axis2.transport.http.AxisServlet</servlet-class> |
| <load-on-startup>1</load-on-startup> |
| </servlet> |
| <servlet-mapping> |
| <servlet-name>AxisServlet</servlet-name> |
| <url-pattern>/services/*</url-pattern> |
| </servlet-mapping> |
| </pre></div> |
| |
| <p> |
| Note that the prefix used in <tt>url-pattern</tt> must match the |
| <tt>servicePath</tt> parameter in <tt>axis2.xml</tt>. The default |
| value of this parameter is <tt>services</tt>, which is compatible |
| with the above configuration. |
| </p> |
| </div> |
| |
| <div class="section"> |
| <h2><a name="Configuring_axis2.xml"></a>Configuring axis2.xml</h2> |
| |
| <p> |
| For each protocol (HTTP and/or HTTPS), an <tt>AxisServletListener</tt> |
| instance must be declared in <tt>axis2.xml</tt>. If only a single |
| protocol is used, no further configuration is required. For example, |
| if only HTTP is used, the following declaration must be present in |
| <tt>axis2.xml</tt>: |
| </p> |
| |
| <div> |
| <pre> |
| <transportReceiver name="http" class="org.apache.axis2.transport.http.AxisServletListener"/> |
| </pre></div> |
| |
| <p> |
| If both HTTP and HTTPS are used, then things become a bit more complicated. |
| The reason is that in order to expose WSDLs with correct endpoint URIs, |
| <tt>AxisServlet</tt> must know the ports used by HTTP and HTTPS. |
| Unfortunately the servlet API doesn't allow a Web application to discover |
| all configured protocols. It only provides information about the protocol, |
| host name and port for the current request. If only a single |
| <tt>AxisServletListener</tt> is configured, then this information is enough |
| to let <tt>AxisServlet</tt> auto-detect the port number. If both HTTP |
| and HTTPS are used (or if WSDLs are retrieved through transports other than |
| <tt>AxisServlet</tt>), then <tt>AxisServlet</tt> has no way of knowing the |
| port numbers until it has processed at least one request |
| for each protocol. To make WSDL generation predictable in this scenario, it |
| is necessary to explicitly configure the port numbers in <tt>axis2.xml</tt>, |
| such as in the following example: |
| </p> |
| |
| <div> |
| <pre> |
| <transportReceiver name="http" class="org.apache.axis2.transport.http.AxisServletListener"> |
| <parameter name="port">8080</parameter> |
| </transportReceiver> |
| |
| <transportReceiver name="https" class="org.apache.axis2.transport.http.AxisServletListener"> |
| <parameter name="port">8443</parameter> |
| </transportReceiver> |
| </pre></div> |
| </div> |
| |
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