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Mark,
On 3/7/16 5:47 PM, Mark Eggers wrote:
> Sean,
>
> I just noticed something else:
>
> On 3/7/2016 2:11 PM, Sean Dawson wrote:
>> On Sun, Mar 6, 2016 at 12:48 PM, Sean Dawson
>> <seandawson2...@gmail.com> wrote:
>>
>>>
>>> Tomcat 8_32 Windows 7 Java 8_51 RestEasy 3.0.11.Final GWT 2.7.0
>>> (Jetty jetty-9.3.5.v20151012)
>>>
>>> Servlet code makes a RestEasy call to another servlet (same
>>> container) - second servlet sets the 'Warning' HTTP header on
>>> response. Would like to access that in first servlet but when
>>> running in Tomcat, that header is not included.
>>>
>>> Code to get header in first servlet:
>>>
>>> Object headers = ((ClientResponseFailure)
>>> e).getResponse().getResponseHeaders().get("Warning");
>>>
>>> Also tried: getHeaders(), getStringHeaders(), and
>>> getHeaderString().
>>>
>>> When running GWT in superdev mode in IntelliJ (15.0.4) using
>>> Jetty, the above returns a List with one item that contains the
>>> warning string. When remote debugging Tomcat, that call
>>> returns null.
>>>
>>> Added this to web app xml, and also tried Tomcat
>>> conf/web.xml...
>>>
>>> <filter> <filter-name>CorsFilter</filter-name>
>>> <filter-class>org.apache.catalina.filters.CorsFilter</filter-class>
>>>
>>>
<init-param>
>>> <param-name>cors.exposed.headers</param-name>
>>> <param-value>Warning</param-value> </init-param> </filter>
>>> <filter-mapping> <filter-name>CorsFilter</filter-name>
>>> <url-pattern>/*</url-pattern> </filter-mapping>
>>>
>>> Also tried cors.allowed.headers.
>>>
>>> Any pointers?
>>>
>>>
>>
>> Alright, lets try this again. Simple reproducible testcase...
>>
>> - download latest Tomcat 8 for Windows 64-bit zip
>> http://mirrors.ocf.berkeley.edu/apache/tomcat/tomcat-8/v8.0.32/bin/ap
ache-tomcat-8.0.32-windows-x64.zip
>>
>>
- - extract somewhere
>> - delete everything in webapps folder - build project below, put
>> in webapps folder - go to: http://localhost:8080/one - check
>> response headers... no Warning header
>>
>> ** pom.xml **
>>
>> <project xmlns="http://maven.apache.org/POM/4.0.0";
>> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
>> xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
>> http://maven.apache.org/maven-v4_0_0.xsd";>
>> <modelVersion>4.0.0</modelVersion>
>>
>> <groupId>test</groupId> <artifactId>tcTest</artifactId>
>> <packaging>war</packaging> <version>1.0-SNAPSHOT</version>
>>
>> <name>tcTest Maven Webapp</name>
>> <url>http://maven.apache.org</url>
>>
>> <dependencies> <dependency> <groupId>org.glassfish</groupId>
>> <artifactId>javax.servlet</artifactId> <version>3.1.1</version>
>> </dependency> <dependency> <groupId>org.jboss.resteasy</groupId>
>> <artifactId>resteasy-client</artifactId>
>> <version>3.0.11.Final</version> </dependency> </dependencies>
>>
>> <build> <finalName>ROOT</finalName> </build> </project>
>>
>>
>> ** web.xml **
>>
>>
>> <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web
>> Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd"; >
>>
>> <web-app> <display-name>Archetype Created Web
>> Application</display-name>
>>
>> <servlet> <servlet-name>One</servlet-name>
>> <servlet-class>pkg.ServletOne</servlet-class> </servlet>
>>
>> <servlet-mapping> <servlet-name>One</servlet-name>
>> <url-pattern>/one/*</url-pattern> </servlet-mapping>
>>
>> <servlet> <servlet-name>Two</servlet-name>
>> <servlet-class>pkg.ServletTwo</servlet-class> </servlet>
>>
>> <servlet-mapping> <servlet-name>Two</servlet-name>
>> <url-pattern>/two/*</url-pattern> </servlet-mapping> </web-app>
>>
>>
>> ** index.html **
>>
>>
>> <html> <body> <h2>Hello World!</h2> </body> </html>
>>
>>
>> ** Caller interface **
>>
>>
>> package pkg;
>>
>> import javax.ws.rs.GET; import javax.ws.rs.Path;
>>
>> public interface Caller { @GET @Path("two") String makeCall(); }
>>
>>
>>
>> ** Servlet one **
>>
>>
>> package pkg;
>>
>> import java.io.IOException;
>>
>> import javax.servlet.ServletException; import
>> javax.servlet.http.HttpServlet; import
>> javax.servlet.http.HttpServletRequest; import
>> javax.servlet.http.HttpServletResponse; import
>> javax.ws.rs.core.MediaType;
>>
>> import org.jboss.resteasy.client.ProxyBuilder;
>>
>> public class ServletOne extends HttpServlet { Caller caller;
>>
>> @Override public void init() throws ServletException { caller =
>> ProxyBuilder.build(Caller.class, "http://localhost:8080";).now();
>> }
>>
>> @Override protected void doGet(HttpServletRequest request,
>> HttpServletResponse response) throws ServletException,
>> IOException { String result = caller.makeCall();
>> response.getWriter().println(result); } }
>>
>>
>> ** Servlet two **
>>
>>
>> package pkg;
>>
>> import java.io.IOException;
>>
>> import javax.servlet.ServletException; import
>> javax.servlet.http.HttpServlet; import
>> javax.servlet.http.HttpServletRequest; import
>> javax.servlet.http.HttpServletResponse;
>>
>> public class ServletTwo extends HttpServlet { @Override protected
>> void doGet(HttpServletRequest request, HttpServletResponse
>> response) throws ServletException, IOException {
>> addHeader(response); response.getWriter().println("Ok"); }
>>
>> void addHeader(HttpServletResponse response) {
>> response.setHeader("Warning", "This is a warning"); // also tried
>> addHeader() } }
>>
>
> <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web
> Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd"; >
>
> Should probably be:
>
> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee";
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
> http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"; version="3.1">
>
> (sorry for the word wrapping).
>
> I normally don't use web.xml in my 3.1 applications. I end up
> using annotations instead.
It probably doesn't matter, since the servlet EG clarified that a
container needs to behave the same regardless of the spec-version
stated in the web.xml file. (Which I think is a very stupid position
to take.)
The behavior is supposed to be whatever the highest spec-compliance
version the container supports (presumably). For example, you can use
servlet async along with a 2.3-version web.xml. More specifically, a
2.3-version web.xml will still have its classes and libraries scanned
for annotations. :(
- -chris
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