Re: Warning response header

[Sean Dawson]

On Tue, Mar 8, 2016 at 10:58 AM, Mark Eggers 
wrote:

> Chris,
>
> On 3/8/2016 7:52 AM, Christopher Schultz wrote:
> > 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
> >>>  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...
> 
>   CorsFilter
>  org.apache.catalina.filters.CorsFilter
> 
> 
> > 
>  cors.exposed.headers
>  Warning  
>   CorsFilter
>  /* 
> 
>  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 **
> >>>
> >>> 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;>
> >>> 4.0.0
> >>>
> >>> test tcTest
> >>> war 1.0-SNAPSHOT
> >>>
> >>> tcTest Maven Webapp
> >>> http://maven.apache.org
> >>>
> >>>   org.glassfish
> >>> javax.servlet 3.1.1
> >>>   org.jboss.resteasy
> >>> resteasy-client
> >>> 3.0.11.Final  
> >>>
> >>>  ROOT  
> >>>
> >>>
> >>> ** web.xml **
> >>>
> >>>
> >>>  >>> Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd; >
> >>>
> >>>  Archetype Created Web
> >>> Application
> >>>
> >>>  One
> >>> pkg.ServletOne 
> >>>
> >>>  One
> >>> /one/* 
> >>>
> >>>  Two
> >>> pkg.ServletTwo 
> >>>
> >>>  Two
> >>> /two/*  
> >>>
> >>>
> >>> ** index.html **
> >>>
> >>>
> >>>   Hello World!  
> >>>
> >>>
> >>> ** 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() } }
> >>>
> >
> >>  >> Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd; >
> >
> >> Should probably be:
> >
> >> http://xmlns.jcp.org/xml/ns/javaee;
> >> 

Re: Warning response header

[Mark Eggers]

Chris,

On 3/8/2016 7:52 AM, Christopher Schultz wrote:
> 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
>>>  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...

  CorsFilter 
 org.apache.catalina.filters.CorsFilter


> 
 cors.exposed.headers 
 Warning   
  CorsFilter 
 /* 

 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 **
>>>
>>> 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;> 
>>> 4.0.0
>>>
>>> test tcTest 
>>> war 1.0-SNAPSHOT
>>>
>>> tcTest Maven Webapp 
>>> http://maven.apache.org
>>>
>>>   org.glassfish 
>>> javax.servlet 3.1.1 
>>>   org.jboss.resteasy 
>>> resteasy-client 
>>> 3.0.11.Final  
>>>
>>>  ROOT  
>>>
>>>
>>> ** web.xml **
>>>
>>>
>>> >> Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd; >
>>>
>>>  Archetype Created Web
>>> Application
>>>
>>>  One 
>>> pkg.ServletOne 
>>>
>>>  One 
>>> /one/* 
>>>
>>>  Two 
>>> pkg.ServletTwo 
>>>
>>>  Two 
>>> /two/*  
>>>
>>>
>>> ** index.html **
>>>
>>>
>>>   Hello World!  
>>>
>>>
>>> ** 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() } }
>>>
> 
>> > Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd; >
> 
>> Should probably be:
> 
>> 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 

Re: Warning response header

[Christopher Schultz]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

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
>>  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...
>>> 
>>>  CorsFilter 
>>> org.apache.catalina.filters.CorsFilter
>>>
>>> 

>>> cors.exposed.headers 
>>> Warning   
>>>  CorsFilter 
>>> /* 
>>> 
>>> 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 **
>> 
>> 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;> 
>> 4.0.0
>> 
>> test tcTest 
>> war 1.0-SNAPSHOT
>> 
>> tcTest Maven Webapp 
>> http://maven.apache.org
>> 
>>   org.glassfish 
>> javax.servlet 3.1.1 
>>   org.jboss.resteasy 
>> resteasy-client 
>> 3.0.11.Final  
>> 
>>  ROOT  
>> 
>> 
>> ** web.xml **
>> 
>> 
>> > Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd; >
>> 
>>  Archetype Created Web
>> Application
>> 
>>  One 
>> pkg.ServletOne 
>> 
>>  One 
>> /one/* 
>> 
>>  Two 
>> pkg.ServletTwo 
>> 
>>  Two 
>> /two/*  
>> 
>> 
>> ** index.html **
>> 
>> 
>>   Hello World!  
>> 
>> 
>> ** 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() } }
>> 
> 
>  Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd; >
> 
> Should probably be:
> 
> 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

Re: Warning response header

[Sean Dawson]

On Mon, Mar 7, 2016 at 5:48 PM, Sean Dawson 
wrote:

>
>
> On Mon, Mar 7, 2016 at 5:44 PM, David Kerber  wrote:
>
>> On 3/7/2016 5:11 PM, Sean Dawson wrote:
>>
>>> On Sun, Mar 6, 2016 at 12:48 PM, Sean Dawson 
>>> 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...

  
  CorsFilter

  org.apache.catalina.filters.CorsFilter
  
  cors.exposed.headers
  Warning
  
  
  
  CorsFilter
  /*
  

 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/apache-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 **
>>>
>>> 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;>
>>>  4.0.0
>>>
>>>  test
>>>  tcTest
>>>  war
>>>  1.0-SNAPSHOT
>>>
>>>  tcTest Maven Webapp
>>>  http://maven.apache.org
>>>
>>>  
>>>  
>>>  org.glassfish
>>>  javax.servlet
>>>  3.1.1
>>>  
>>>  
>>>  org.jboss.resteasy
>>>  resteasy-client
>>>  3.0.11.Final
>>>  
>>>  
>>>
>>
>> If you're adding Maven, Glassfish and JBoss, you're adding a LOT of
>> complexity to your "simple" reproducible!  I've never used any of them, so
>> would have no hope of reproducing your issue.  And there's a fair chance
>> that it has nothing to do with Tomcat anyway, given all the other stuff
>> around it...
>>
>>
> I could remove JBoss from the equation - and maven, although I'm pretty
> sure that's not adding much complexity.  If I run it on jetty instead of
> tomcat, it works fine.  So I'm leaning toward Tomcat (or something extra I
> need to do for Tomcat) as the issue.
>
>
Ok using httpclient instead of RestEasy shows the header.  Strange that
RestEasy passes headers in the Jetty case but not the Tomcat one. But I'll
see if I can get help from them. Thanks.


>>
>>
>>>  
>>>  ROOT
>>>  
>>> 
>>>
>>>
>>> ** web.xml **
>>>
>>>
>>> >>  "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
>>>  "http://java.sun.com/dtd/web-app_2_3.dtd; >
>>>
>>> 
>>>  Archetype Created Web Application
>>>
>>>  
>>>  One
>>>  pkg.ServletOne
>>>  
>>>
>>>  
>>>  One
>>>  /one/*
>>>  
>>>
>>>  
>>>  Two
>>>  pkg.ServletTwo
>>>  
>>>
>>>  
>>>  Two
>>>  /two/*
>>>  
>>> 
>>>
>>>
>>> ** index.html **
>>>
>>>
>>> 
>>> 
>>> Hello World!
>>> 
>>> 
>>>
>>>
>>> ** 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 

Re: Warning response header

[Sean Dawson]

On Mon, Mar 7, 2016 at 5:44 PM, David Kerber  wrote:

> On 3/7/2016 5:11 PM, Sean Dawson wrote:
>
>> On Sun, Mar 6, 2016 at 12:48 PM, Sean Dawson 
>> 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...
>>>
>>>  
>>>  CorsFilter
>>>
>>>  org.apache.catalina.filters.CorsFilter
>>>  
>>>  cors.exposed.headers
>>>  Warning
>>>  
>>>  
>>>  
>>>  CorsFilter
>>>  /*
>>>  
>>>
>>> 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/apache-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 **
>>
>> 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;>
>>  4.0.0
>>
>>  test
>>  tcTest
>>  war
>>  1.0-SNAPSHOT
>>
>>  tcTest Maven Webapp
>>  http://maven.apache.org
>>
>>  
>>  
>>  org.glassfish
>>  javax.servlet
>>  3.1.1
>>  
>>  
>>  org.jboss.resteasy
>>  resteasy-client
>>  3.0.11.Final
>>  
>>  
>>
>
> If you're adding Maven, Glassfish and JBoss, you're adding a LOT of
> complexity to your "simple" reproducible!  I've never used any of them, so
> would have no hope of reproducing your issue.  And there's a fair chance
> that it has nothing to do with Tomcat anyway, given all the other stuff
> around it...
>
>
I could remove JBoss from the equation - and maven, although I'm pretty
sure that's not adding much complexity.  If I run it on jetty instead of
tomcat, it works fine.  So I'm leaning toward Tomcat (or something extra I
need to do for Tomcat) as the issue.


>
>
>>  
>>  ROOT
>>  
>> 
>>
>>
>> ** web.xml **
>>
>>
>> >  "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
>>  "http://java.sun.com/dtd/web-app_2_3.dtd; >
>>
>> 
>>  Archetype Created Web Application
>>
>>  
>>  One
>>  pkg.ServletOne
>>  
>>
>>  
>>  One
>>  /one/*
>>  
>>
>>  
>>  Two
>>  pkg.ServletTwo
>>  
>>
>>  
>>  Two
>>  /two/*
>>  
>> 
>>
>>
>> ** index.html **
>>
>>
>> 
>> 
>> Hello World!
>> 
>> 
>>
>>
>> ** 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 

Re: Warning response header

[Mark Eggers]

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 
> 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...
>>
>> 
>> CorsFilter
>> org.apache.catalina.filters.CorsFilter
>> 
>> cors.exposed.headers
>> Warning
>> 
>> 
>> 
>> CorsFilter
>> /*
>> 
>>
>> 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/apache-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 **
> 
> 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;>
> 4.0.0
> 
> test
> tcTest
> war
> 1.0-SNAPSHOT
> 
> tcTest Maven Webapp
> http://maven.apache.org
> 
> 
> 
> org.glassfish
> javax.servlet
> 3.1.1
> 
> 
> org.jboss.resteasy
> resteasy-client
> 3.0.11.Final
> 
> 
> 
> 
> ROOT
> 
> 
> 
> 
> ** web.xml **
> 
> 
>  "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
> "http://java.sun.com/dtd/web-app_2_3.dtd; >
> 
> 
> Archetype Created Web Application
> 
> 
> One
> pkg.ServletOne
> 
> 
> 
> One
> /one/*
> 
> 
> 
> Two
> pkg.ServletTwo
> 
> 
> 
> Two
> /two/*
> 
> 
> 
> 
> ** index.html **
> 
> 
> 
> 
> Hello World!
> 
> 
> 
> 
> ** 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()
> }
> }
> 

http://java.sun.com/dtd/web-app_2_3.dtd; >

Should probably be:

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.

. . . 

Re: Warning response header

[Sean Dawson]

ublic 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()
> > }
> > }
> >
>
>  
>  org.glassfish
>  javax.servlet
>  3.1.1
>  
>
> This is wrong and will include the servlet API in your WAR file.
>
>
Thanks for your reply Mark. Minor oversight. I added provided to the
servlet dependency and tried it again - same result (ie. no Warning
response  header).  These are all I see:


   1. HTTP/1.1 200 OK Server: Apache-Coyote/1.1 Content-Length: 6 Date:
   Mon, 07 Mar 2016 22:43:00 GMT

I didn't use cors in this example, but it's the same result as the larger
app with cors in the web.xml for both tomcat and the webapp.


You at least need:
>
> 
>   org.glassfish
>   javax.servlet
>   3.1.1
>   provided
> 
>
> I actually use the following in my Jersey applications:
> 
> 2.22.1
> 1.7
> 3.1.0
> UTF-8
> 
>
> 
> 
> javax.servlet
> javax.servlet-api
> ${version.servlet.api}
> provided
> 
> 
> javax.servlet.jsp
> javax.servlet.jsp-api
> 2.3.0
> provided
> 
> 
> 
> javax.servlet.jsp.jstl
> javax.servlet.jsp.jstl-api
> 1.2.1
> 
> 
> 
> javax.servlet
> servlet-api
> 
> 
> javax.servlet.jsp
> jsp-api
> 
> 
> 
> 
> 
> org.apache.taglibs
> taglibs-standard-impl
> 1.2.5
> 
> 
>
> I don't know if this will help solve your problem, but getting the
> servlet api out of your WAR file is a good start.
>
> . . . just my two cents
> /mde/
>
>

Re: Warning response header

[David Kerber]

On 3/7/2016 5:11 PM, Sean Dawson wrote:

On Sun, Mar 6, 2016 at 12:48 PM, Sean Dawson 
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...

 
 CorsFilter
 org.apache.catalina.filters.CorsFilter
 
 cors.exposed.headers
 Warning
 
 
 
 CorsFilter
 /*
 

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/apache-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 **

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;>
 4.0.0

 test
 tcTest
 war
 1.0-SNAPSHOT

 tcTest Maven Webapp
 http://maven.apache.org

 
 
 org.glassfish
 javax.servlet
 3.1.1
 
 
 org.jboss.resteasy
 resteasy-client
 3.0.11.Final
 
 


If you're adding Maven, Glassfish and JBoss, you're adding a LOT of 
complexity to your "simple" reproducible!  I've never used any of them, 
so would have no hope of reproducing your issue.  And there's a fair 
chance that it has nothing to do with Tomcat anyway, given all the other 
stuff around it...





 
 ROOT
 



** web.xml **


http://java.sun.com/dtd/web-app_2_3.dtd; >


 Archetype Created Web Application

 
 One
 pkg.ServletOne
 

 
 One
 /one/*
 

 
 Two
 pkg.ServletTwo
 

 
 Two
 /two/*
 



** index.html **




Hello World!




** 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()
 }
}




-
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Re: Warning response header

[Mark Eggers]

Sean,

See comment at the end.

On 3/7/2016 2:11 PM, Sean Dawson wrote:
> On Sun, Mar 6, 2016 at 12:48 PM, Sean Dawson 
> 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...
>>
>> 
>> CorsFilter
>> org.apache.catalina.filters.CorsFilter
>> 
>> cors.exposed.headers
>> Warning
>> 
>> 
>> 
>> CorsFilter
>> /*
>> 
>>
>> 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/apache-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 **
> 
> 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;>
> 4.0.0
> 
> test
> tcTest
> war
> 1.0-SNAPSHOT
> 
> tcTest Maven Webapp
> http://maven.apache.org
> 
> 
> 
> org.glassfish
> javax.servlet
> 3.1.1
> 
> 
> org.jboss.resteasy
> resteasy-client
> 3.0.11.Final
> 
> 
> 
> 
> ROOT
> 
> 
> 
> 
> ** web.xml **
> 
> 
>  "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
> "http://java.sun.com/dtd/web-app_2_3.dtd; >
> 
> 
> Archetype Created Web Application
> 
> 
> One
> pkg.ServletOne
> 
> 
> 
> One
> /one/*
> 
> 
> 
> Two
> pkg.ServletTwo
> 
> 
> 
> Two
> /two/*
> 
> 
> 
> 
> ** index.html **
> 
> 
> 
> 
> Hello World!
> 
> 
> 
> 
> ** 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()
> }
> }
> 

 
 org.glassfish
 javax.servlet
 3.1.1
 

This is wrong and will include the servlet API in your WAR file.

You at least need:


  org.glassfish
  javax.servlet
  3.1.1
  provided


I actually use the following in my Jersey applications:

2.22.1
1.7
3.1.0
UTF-8




javax.servlet
javax.servlet-api
${version.servlet.api}
provided

Re: Warning response header

[Sean Dawson]

On Sun, Mar 6, 2016 at 12:48 PM, Sean Dawson 
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...
>
> 
> CorsFilter
> org.apache.catalina.filters.CorsFilter
> 
> cors.exposed.headers
> Warning
> 
> 
> 
> CorsFilter
> /*
> 
>
> 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/apache-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 **

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;>
4.0.0

test
tcTest
war
1.0-SNAPSHOT

tcTest Maven Webapp
http://maven.apache.org



org.glassfish
javax.servlet
3.1.1


org.jboss.resteasy
resteasy-client
3.0.11.Final




ROOT




** web.xml **


http://java.sun.com/dtd/web-app_2_3.dtd; >


Archetype Created Web Application


One
pkg.ServletOne



One
/one/*



Two
pkg.ServletTwo



Two
/two/*




** index.html **




Hello World!




** 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()
}
}

Warning response header

[Sean Dawson]

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...


CorsFilter
org.apache.catalina.filters.CorsFilter

cors.exposed.headers
Warning



CorsFilter
/*


Also tried cors.allowed.headers.

Any pointers?