https://bz.apache.org/bugzilla/show_bug.cgi?id=62253
Bug ID: 62253
Summary: response.setContentType() changes the content type
after response.getWriter() is called
Product: Tomcat 9
Version: 9.0.6
Hardware: PC
OS: Linux
Status: NEW
Severity: minor
Priority: P2
Component: Servlet
Assignee: dev@tomcat.apache.org
Reporter: stiemann...@gmail.com
Target Milestone: -----
The Servlet 3.1 and 4.0 Specifications state (in section 5.5/5.6
Internationalization):
The setCharacterEncoding, setContentType, and setLocale methods can be called
repeatedly to change the character encoding. Calls made after the servlet
response’s getWriter method has been called or after the response is committed
have no effect on the character encoding.
Steps to Reproduce:
The bug can be reproduced by following the steps below or following the
README.md in this reproducer project:
https://github.com/stiemannkj1/set-content-type-after-get-writer.
1. Create a web application project with the following servlet and web.xml:
SetContentTypeAfterGetWriterServletImpl.java:
```
public class SetContentTypeAfterGetWriterServletImpl extends HttpServlet {
private static final long serialVersionUID = 374928004261838614L;
@Override
protected void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/plain");
PrintWriter writer = response.getWriter();
response.setContentType("text/html");
writer.println("<html>");
writer.println("<body>");
writer.print("<h1>");
writer.print(response.getContentType());
writer.println("</h1>");
writer.println("</body>");
writer.println("</html>");
}
}
```
web.xml:
```
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd";>
<servlet>
<servlet-name>SetContentTypeAfterGetWriterServlet</servlet-name>
<servlet-class>set.content.type.after.get.writer.SetContentTypeAfterGetWriterServletImpl</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>SetContentTypeAfterGetWriterServlet</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
</web-app>
```
2. Build, deploy, and navigate to the project.
If the bug still exists, "text/html" (along with a charset) will appear in the
browser.
If the bug is fixed, the following text will appear in the browser:
```
<html>
<body>
<h1>text/plain;charset=ISO-8859-1</h1>
</body>
</html>
```
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