状态码为4xx时，GAE / J将Content-Type从JSON更改为HTML [英] GAE/J changes Content-Type from JSON to HTML when the status code is 4xx
问题描述
HTTP / 1.1 403 Forbidden
Content-Type：application / json; charset = UTF-8
...
{resultCode：...}
它可以像预期的那样在本地GAE dev服务器上运行。然而，在真正的GAE上，内容类型从JSON更改为HTML 。
HTTP / 1.1。 403禁止
Content-Type：text / html; charset = utf-8
...
< html>< head>
< meta http-equiv =content-typecontent =text / html; charset = utf-8>
< title> 403 Forbidden< / title>
< / head>
< body text =＃000000 bgcolor =＃ffffff>
< h1>错误：禁止< / h1>
< / body>< / html>
如何防止GAE更改内容类型和实体正文？
其他信息
我的端点不会引发任何异常。它返回一个Response实例。下面的代码片段是一个测试端点。在本地GAE开发服务器上，此端点返回JSON。在真正的GAE上，它返回HTML。太好了。
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.Status;
@Path（/ test）
public class TestEndpoint
{
@GET
public Response get（）
{
返回响应
.status（Status.BAD_REQUEST）
.type（MediaType.APPLICATION_JSON_TYPE）
.entity（{\id \：1}）
.build（）;
其他信息2
我写了一个更简单的示例代码，如下所示。 即使在真正的GAE上，此代码也会返回JSON！有什么区别？
$ b
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
$ b public class TestServlet extends HttpServlet
{
@Override
protected void doGet（HttpServletRequest请求，HttpServletResponse响应）
抛出ServletException，IOException异常
{
response.setStatus（400）;
response.setContentType（application / json; charset = UTF-8）;
PrintWriter out = response.getWriter（）;
out.write（{\hello \：\world \}）;
}
}
解决方案 I阅读泽西岛的源代码并直观地回答了这个问题。
设置 jersey.config.server.response.setStatusOverSendError （Jersey's 服务器配置属性）真正解决了这个问题。
以下是我的新web.xml的摘录。
$ b
< servlet的>
< servlet-name> API< / servlet-name>
< servlet-class> org.glassfish.jersey.servlet.ServletContainer< / servlet-class>
< init-param>
< param-name> jersey.config.server.provider.classnames< / param-name>
< param-value>
......
< / param-value>
< / init-param>
< init-param>
< param-name> jersey.config.server.response.setStatusOverSendError< / param-name>
< param-value> true< /参数值>
< / init-param>
< / servlet>
I wrote a Web API in Java (JAX-RS by Jersey) which returns "403 Forbidden" with JSON.
HTTP/1.1 403 Forbidden
Content-Type: application/json; charset=UTF-8
...
{"resultCode":"..."}
It works on the local GAE dev server as expected. However, on the real GAE, the content type is changed from JSON to HTML.
HTTP/1.1. 403 Forbidden
Content-Type: text/html; charset=utf-8
...
<html><head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<title>403 Forbidden</title>
</head>
<body text=#000000 bgcolor=#ffffff>
<h1>Error: Forbidden</h1>
</body></html>
How can I prevent GAE from changing the content type and the entity body?
Additional Information
My endpoint does not throw any exception. It returns a Response instance. The code snippet below is a test endpoint. On the local GAE dev server, this endpoint returns JSON. On the real GAE, it returns HTML. Too much of a good thing.
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.Status;
@Path("/test")
public class TestEndpoint
{
@GET
public Response get()
{
return Response
.status(Status.BAD_REQUEST)
.type(MediaType.APPLICATION_JSON_TYPE)
.entity("{\"id\":1}")
.build();
}
}
Additional Information 2
I wrote a simpler example code like below. This code returns JSON even on the real GAE! What's the difference?
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class TestServlet extends HttpServlet
{
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
response.setStatus(400);
response.setContentType("application/json;charset=UTF-8");
PrintWriter out = response.getWriter();
out.write("{\"hello\":\"world\"}");
}
}
I read Jersey's source code and intuited this answer.
Setting "jersey.config.server.response.setStatusOverSendError" (one of Jersey's server configuration properties) to true solved the issue.
The following is an excerpt from my new web.xml.
<servlet>
<servlet-name>API</servlet-name>
<servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>jersey.config.server.provider.classnames</param-name>
<param-value>
......
</param-value>
</init-param>
<init-param>
<param-name>jersey.config.server.response.setStatusOverSendError</param-name>
<param-value>true</param-value>
</init-param>
</servlet>
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