title: JAX-RS custom headers not being added to redirect response
body: <p>I am trying to add some custom header parameters to a HTTP 303 (redirect) response. However, the new headers seem to be getting stripped from the response. </p>
  
  <p>This code is meant to receive a request and returns a HTTP 303 response:</p>
  
  <pre><code>@POST
  @Path("/authorize")
  @Produces("application/x-www-form-urlencoded")
  public Response getOAuthGrant(@HeaderParam(OAuth2.AUTHORIZATION)    @DefaultValue("") String authorization,
                                @HeaderParam(OAuth2.CLIENT_ID)        @DefaultValue("") String clientId,
                                @HeaderParam(OAuth2.CLIENT_SECRET)    @DefaultValue("") String clientSecret,
                                @HeaderParam(OAuth2.GRANT_TYPE)       @DefaultValue("") String grantType) throws InternalServerException, UnauthorizedException {
  
          OAuth2.validateGrantRequest(clientId, clientSecret, authorization, grantType);
  
          ApiTokenV2 apiTokenV2 = new ApiTokenV2();
  
          try {
              apiTokenV2 = TokenManager.getApiToken(clientId);
  
              if (apiTokenV2 != null) {
                  apiTokenV2.generateAccessGrant(clientId);
              } else {
                  logger.error("Error in TokenEndpoint. Retrieved token is null.");
                  throw new InternalServerException("A server error occurred while trying to authorize the requester. Could not find 'generateAccessGrant' method");
              } 
          } catch (NamingException e) {
              throw new InternalServerException("A server error occurred while trying to authorize grant request. Could not find 'generateAccessGrant' method.", e);
          }
  
          return Response.status(Response.Status.SEE_OTHER)
                         .type(MediaType.APPLICATION_FORM_URLENCODED_TYPE)
                         .header("Location", "/api/token")
                         .header("Authorization", "OAuth")
                         .header("Access-Grant", apiTokenV2.getAccessGrant())
                         .build();
  }
  </code></pre>
  
  <p>What am I doing wrong here? Should I be using <code>@Context</code> instead?</p>