开放自由上的HTTP/2支持 [英] HTTP/2 Support on Open Liberty
问题描述
Open Liberty是否支持HTTP/2，还是需要在server.xml上进行设置?香港专业教育学院环顾四周，但找不到与此有关的任何东西
Does Open Liberty support HTTP/2, or does it need a setting on server.xml? Ive had a look around but cant find anything relating to this
此刻我有一个推式servlet-
I have a push servlet at the moment -
public class PushServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
PushBuilder pushBuilder = req.newPushBuilder();
pushBuilder.path("push.css").push();
try (PrintWriter respWriter = resp.getWriter();) {
respWriter.write("<html>" +
"<img src='images/kodedu-logo.png'>" +
"</html>");
}
}
}
并且在newPushBuilder上收到NullPointerException
And am getting a NullPointerException on newPushBuilder
我运行了Major/Minor版本，它确认我正在根据我的pom运行Servlet 4.0-
I ran the Major/Minor version and it confirmed I'm running Servlet 4.0 in line with my pom -
<dependencies>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>8.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
我的server.xml配置为-
My server.xml is configured as -
<!-- To access this server from a remote client add a host attribute to
the following element, e.g. host="*" -->
<httpEndpoint httpPort="9080" httpsPort="9443" id="defaultHttpEndpoint" >
<httpOptions http2="enabled" />
</httpEndpoint>
我也正在运行Java9
Also Im running Java9
推荐答案
You're getting a NullPointerException because Push isn't supported for the request you're working with. You should check for null before using the PushBuilder object.
对HTTP/2的开放自由支持仍在开发中.在最新的开发版本中，如果您执行以下操作，则newPushBuilder()将返回PushBuilder:
Open liberty support for HTTP/2 is still in development. In the most recent development builds, newPushBuilder() will return a PushBuilder if you:
- 实施Servlet 4.0，
- 启用
servlet-4.0功能，然后 - 使用不安全的HTTP/2(
h2c)或通过ALPN(h2)的安全HTTP/2驱动请求
- implement Servlet 4.0,
- enable the
servlet-4.0feature, and - drive a request using insecure HTTP/2 (
h2c) or secure HTTP/2 via ALPN (h2)
*浏览器不支持不安全的h2c，Java 8不支持ALPN.因此，要在开放式自由环境中使用ALPN，当前的最佳方法是与Oracle或openjdk的JDK一起使用，并使用bootclasspath技巧来运行.启用ALPN. Oracle和Jetty提供了引导类路径jar- grizzly-npn-bootstrap 和
*Browsers don't support insecure h2c, and ALPN isn't supported on Java 8. So to use ALPN on open-liberty the current best approach is to run with a JDK from Oracle or openjdk along with a bootclasspath trick to enable ALPN. Oracle and Jetty provide bootclasspath jars - grizzly-npn-bootstrap and alpn-boot - that when configured allow open-liberty to use ALPN to negoiate secure HTTP/2.
这篇关于开放自由上的HTTP/2支持的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
