blocks|key|3116378|text|为什么不用一个空的超文本标记语言页面配置<error-page>元素呢？|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3116379|entityMap^0|K|C|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

Why not just configure the <code>&lt;error-page&gt;</code> element with an empty HTML page?

blocks|key|344276|text|如果您不希望tomcat显示错误页面，则不要使用sendError(...)。请改用setStatus(...)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|344277|例如，如果你想给出一个405的响应，那么你可以这样做|344278|response.setStatus(HttpServletResponse.SC_METHOD_NOT_ALLOWED);++++++
response.getWriter().println("The+method+"+%2B+request.getMethod()+%2B+
+++"+is+not+supported+by+this+service.");|code-block|syntax|javascript|344279|还要记住，不要从servlet抛出任何异常。相反，捕捉异常，并再次设置您自己的statusCode。|344280|即|344281|protected+void+service(HttpServletRequest+request,
++++++HttpServletResponse+response)+throws+IOException+{
++try+{

++++//+servlet+code+here,+e.g.+super.service(request,+response);

++}+catch+(Exception+e)+{
++++//+log+the+error+with+a+timestamp,+show+the+timestamp+to+the+user
++++long+now+=+System.currentTimeMillis();
++++log("Exception+"+%2B+now,+e);
++++response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
++++response.getWriter().println("Guru+meditation:+"+%2B+now);
++}
}|344282|当然，如果你不想要任何内容，那就不要写任何东西给作者，只需设置状态即可。|344283|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|X|8|@]|9|@]|A|$G|H]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

If you do not want tomcat to show an error page, then do not use sendError(...). Instead use setStatus(...). 

e.g. if you want to give a 405 response, then you do

<pre><code>response.setStatus(HttpServletResponse.SC_METHOD_NOT_ALLOWED); 
response.getWriter().println("The method " + request.getMethod() + 
 " is not supported by this service.");
</code></pre>

Also remember not to throw any Exceptions from your servlet. Instead catch the Exception and, again, set the statusCode your self.

i.e.

<pre><code>protected void service(HttpServletRequest request,
 HttpServletResponse response) throws IOException {
 try {

 // servlet code here, e.g. super.service(request, response);

 } catch (Exception e) {
 // log the error with a timestamp, show the timestamp to the user
 long now = System.currentTimeMillis();
 log("Exception " + now, e);
 response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
 response.getWriter().println("Guru meditation: " + now);
 }
}
</code></pre>

of course, if you do not want any content, then just don't write anything to the writer, just set the status.

blocks|key|344291|text|正如Heikki所说，设置状态而不是sendError()会导致Tomcat不会接触到响应实体/正文/有效负载。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|344292|如果您只想发送没有任何实体的响应头，就像我的例子一样，|344293|response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
response.setContentLength(0);|code-block|syntax|javascript|344294|真的很管用。使用Content-Length:+0时，即使使用print()也不会有任何效果，例如：|344295|response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
response.setContentLength(0);
response.getWriter().print("this+string+will+be+ignored+due+to+the+above+line");|344296|客户端收到如下内容：|344297|HTTP/1.1+401+Unauthorized
Server:+Apache-Coyote/1.1
Content-Type:+text/html;charset=utf-8
Content-Length:+0
Date:+Wed,+28+Sep+2011+08:59:49+GMT|344298|如果要发送一些错误消息，请使用消息长度(非零)的setContentLength()，也可以将其留给服务器|344299|entityMap^0|I|B|0|0|0|8|H|V|7|0|0|0|0|O|I|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|12|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|13|8|@$9|14|A|15|B|C]|$9|16|A|17|B|C]]|D|@]|E|$]]|$1|O|3|P|5|J|7|18|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|19|8|@]|D|@]|E|$]]|$1|S|3|T|5|J|7|1A|8|@]|D|@]|E|$K|L]]|$1|U|3|V|5|6|7|1B|8|@$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|W|3|-4|5|6|7|1E|8|@]|D|@]|E|$]]]|X|$]]

As Heikki said, setting the status instead of <code>sendError()</code> causes the Tomcat not touch the response entity/body/payload.

If you only want to send the response headers without any entity, like in my case,

<pre><code>response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
response.setContentLength(0);
</code></pre>

does the trick. With <code>Content-Length: 0</code>, the <code>print()</code> will have no effect even if used, like:

<pre><code>response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
response.setContentLength(0);
response.getWriter().print("this string will be ignored due to the above line");
</code></pre>

the client receives something like:

<pre><code>HTTP/1.1 401 Unauthorized
Server: Apache-Coyote/1.1
Content-Type: text/html;charset=utf-8
Content-Length: 0
Date: Wed, 28 Sep 2011 08:59:49 GMT
</code></pre>

If you want to send some error message, use the <code>setContentLength()</code> with message length (other than zero) or you can leave it to the server

blocks|key|343450|text|阻止Tomcat发送任何错误主体的快速、稍微脏但简单的方法是对tomcat主机调用setErrorReportValveClass，并使用一个自定义的错误报告值覆盖report而不做任何事情。即：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|343451|public+class+SecureErrorReportValve+extends+ErrorReportValve+{

@Override
protected+void+report(Request+request,Response+response,Throwable+throwable)+{
}

}|code-block|syntax|javascript|343452|并将其设置为：|343453|++((StandardHost)+tomcat.getHost()).setErrorReportValveClass(yourErrorValveClassName);|343454|如果你想发送你的消息，只是认为Tomcat不应该搞乱它，你想要一些类似的东西：|343455|@Override
protected+void+report(final+Request+request,+final+Response+response,+final+Throwable+throwable)+{
++++String+message+=+response.getMessage();
++++if+(message+!=+null)+{
++++++++try+{
++++++++++++response.getWriter().print(message);
++++++++++++response.finishResponse();
++++++++}+catch+(IOException+e)+{
++++++++}
++++}
}|343456|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

The quick, slightly dirty, but easy way of stopping Tomcat from sending any error body is to call setErrorReportValveClass against the tomcat host, with a custom error report valve which overrides report to do nothing. ie:

<pre><code>public class SecureErrorReportValve extends ErrorReportValve {

@Override
protected void report(Request request,Response response,Throwable throwable) {
}

}
</code></pre>

and set it with:

<pre><code> ((StandardHost) tomcat.getHost()).setErrorReportValveClass(yourErrorValveClassName);
</code></pre>

If you want to send your message, and just think Tomcat shouldn't mess with it, you want something along the lines of:

<pre><code>@Override
protected void report(final Request request, final Response response, final Throwable throwable) {
 String message = response.getMessage();
 if (message != null) {
 try {
 response.getWriter().print(message);
 response.finishResponse();
 } catch (IOException e) {
 }
 }
}
</code></pre>

blocks|key|343458|text|虽然这个问题有点老，但我也遇到了这个问题。首先，Tomcat的行为是绝对正确的。这是每个Servlet规范。任何人都不应该改变Tomcat的行为来违反规范。正如Heikki+Vesalainen和mrCoder提到的，只使用setStatus和setStatus。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|343459|对于那些可能关心它的人，我已经向Tomcat提出了一个ticket，以改进sendError的文档。|343460|entityMap|0|LINK|mutability|MUTABLE|url|https://issues.apache.org/bugzilla/show_bug.cgi?id=54198^0|34|9|3E|9|0|11|9|R|6|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]|$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|H|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

Though this question is a bit old, I ran into this problem too. First of all, Tomcat's behavior is absolutely correct. This is per Servlet Spec. One should not alter Tomcat's behavior against the spec. As Heikki Vesalainen and mrCoder mentioned, use <code>setStatus</code> and <code>setStatus</code> only.

To whom it may concern, I have raised a <a href="https://issues.apache.org/bugzilla/show_bug.cgi?id=54198" rel="nofollow">ticket</a> with Tomcat to improve the docs of <code>sendError</code>.

blocks|key|3329223|text|尽管它符合Servlet规范，但出于安全原因，我不希望tomcat或任何其他Servlet容器发送错误详细信息。我对此也有些纠结。经过搜索和尝试，解决方案可以总结为：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3329224|就像其他人提到的那样，不要使用|3329225|，而是使用sendError()而不是setStatus()，比如Spring+Security+use+sendError()+though...|unordered-list-item|offset|length|style|CODE|3329226|
|3329227|write+asendError()+Filter|3329228|3329229|a.将对sendError()的调用重定向到setStatus()|3329230|b.刷新末尾的响应，以防止容器进一步修改响应|3329231|A+little+example+servlet+filter+doing+this+can+be+found+here。|3329232|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.oracle.com/javaee/6/api/javax/servlet/Filter.html|1|https://gist.github.com/4545911^0|0|0|5|B|J|B|1H|B|0|0|7|B|J|6|J|6|0|0|0|4|B|M|B|0|0|0|1O|1|0^^$0|@$1|2|3|4|5|6|7|15|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|16|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|17|8|@$G|18|H|19|I|J]|$G|1A|H|1B|I|J]|$G|1C|H|1D|I|J]]|9|@]|A|$]]|$1|K|3|L|5|6|7|1E|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|1F|8|@$G|1G|H|1H|I|J]|$G|1I|H|1J|I|J]]|9|@$G|1K|H|1L|1|1M]]|A|$]]|$1|O|3|-4|5|6|7|1N|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1O|8|@$G|1P|H|1Q|I|J]|$G|1R|H|1S|I|J]]|9|@]|A|$]]|$1|R|3|S|5|6|7|1T|8|@]|9|@]|A|$]]|$1|T|3|U|5|6|7|1U|8|@]|9|@$G|1V|H|1W|1|1X]]|A|$]]|$1|V|3|-4|5|6|7|1Y|8|@]|9|@]|A|$]]]|W|$X|$5|Y|Z|10|A|$11|12]]|13|$5|Y|Z|10|A|$11|14]]]]

Although it's Servlet spec compliant, for security reasons I don't want tomcat or any other Servlet container to send error details. I struggled with this as well a bit. After searching and trying, the solution can be summed up as:
<ol>
<li>as others mentioned, don't use <code>sendError()</code>, use <code>setStatus()</code> instead (<a href="https://stackoverflow.com/a/36600434/505893">in Jersey framework you can choose</a>)</li>
<li>frameworks like e.g. Spring Security use <code>sendError()</code> though...</li>
<li>write a <a href="http://docs.oracle.com/javaee/6/api/javax/servlet/Filter.html" rel="nofollow noreferrer"><code>Filter</code></a> that 
a. redirects calls to <code>sendError()</code> to <code>setStatus()</code> 
b. flushes the response at the end to prevent the container from further modifying the response</li>
</ol>
<a href="https://gist.github.com/4545911" rel="nofollow noreferrer">A little example servlet filter doing this can be found here</a>.

blocks|key|346915|text|虽然这并不能准确地回应这个问题上的“不发送任何东西”的声明，但在Clive+Evans'+answer的浪潮中，我发现在tomcat中，你可以在不创建自定义ErrorReportValve的情况下让那些太冗长的文本从错误页面中消失。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|346916|您可以通过“server.xml”上的两个参数"showReport“和"showServerInfo”来完成此自定义ErrorReportValve：|346917|<Valve+className="org.apache.catalina.valves.ErrorReportValve"+showReport="false"+showServerInfo="false"+/>|code-block|syntax|javascript|346918|Link+to+official+documentation。|346919|在tomcat+7.0.55上适用于我，在tomcat+7.0.47上不适用(我认为是因为下面的链接http://www.mail-archive.com/users@tomcat.apache.org/msg113856.html上的一些报道)|346920|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/8166149/1504300|1|http://tomcat.apache.org/tomcat-7.0-doc/config/valve.html#Error_Report_Valve|2|http://www.mail-archive.com/users@tomcat.apache.org/msg113856.html^0|W|J|0|0|0|0|0|U|1|0|1E|1U|2|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]]|C|$]]|$1|D|3|E|5|6|7|14|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|15|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|16|8|@]|9|@$A|17|B|18|1|19]]|C|$]]|$1|M|3|N|5|6|7|1A|8|@]|9|@$A|1B|B|1C|1|1D]]|C|$]]|$1|O|3|-4|5|6|7|1E|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]|W|$5|R|S|T|C|$U|X]]|Y|$5|R|S|T|C|$U|Z]]]]

Although this doesn't respond exactly to the "not send anything" statement on the question, and on the wave of <a href="https://stackoverflow.com/a/8166149/1504300">Clive Evans' answer</a>, I found out that in tomcat you can make those too much verbose texts go away from error pages without creating a custom ErrorReportValve.

You can accomplish to this customizing ErrorReportValve through the 2 params "showReport" and "showServerInfo" on your "server.xml":

<pre><code>&lt;Valve className="org.apache.catalina.valves.ErrorReportValve" showReport="false" showServerInfo="false" /&gt;
</code></pre>

<a href="http://tomcat.apache.org/tomcat-7.0-doc/config/valve.html#Error_Report_Valve" rel="noreferrer">Link to official documentation</a>.

Worked for me on tomcat 7.0.55, didn't work for me on tomcat 7.0.47 (I think because of something reported on the following link <a href="http://www.mail-archive.com/users@tomcat.apache.org/msg113856.html" rel="noreferrer">http://www.mail-archive.com/users@tomcat.apache.org/msg113856.html</a>)

blocks|key|3116603|text|在web.xml中配置<error-page>元素|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3116604|编辑$CATALINA_HOME/conf/web.xml，在末尾添加以下<error-page>，保存并重新启动tomcat|3116605|<web-app>

...
...
...

++++<error-page>
++++++++<error-code>404</error-code>
++++++++<location>/404.html</location>
++++</error-page>

++++<error-page>
++++++++<error-code>500</error-code>
++++++++<location>/500.html</location>
++++</error-page>

++++<error-page>
++++++++<error-code>400</error-code>
++++++++<location>/400.html</location>
++++</error-page>

</web-app>|code-block|syntax|javascript|3116606|3116607|尽管我实际上没有为那些指定的location值创建有效的路由(例如/400.html)+|unordered-list-item|3116608|，但它的工作效果与我预期的一样好|3116609|3116610|在此之前|3116611|​|3116612|📷|atomic|3116613|3116614|之后|3116615|3116616|3116617|3116618|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/43cabc307878fe67ba2a5488259a7c2d.png|imageAlt|1|https://ask.qcloudimg.com/http-save/yehe-900000/b302c754c7f981bf87fbebe99ef24e09.png^0|1|7|B|C|0|2|R|11|C|0|0|0|E|8|X|9|0|0|0|0|0|0|1|0|0|0|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|1H|8|@$9|1I|A|1J|B|C]|$9|1K|A|1L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1M|8|@$9|1N|A|1O|B|C]|$9|1P|A|1Q|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|1R|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|1S|8|@]|D|@]|E|$]]|$1|N|3|O|5|P|7|1T|8|@$9|1U|A|1V|B|C]|$9|1W|A|1X|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1Y|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1Z|8|@]|D|@]|E|$]]|$1|T|3|U|5|6|7|20|8|@]|D|@]|E|$]]|$1|V|3|W|5|6|7|21|8|@]|D|@]|E|$]]|$1|X|3|Y|5|Z|7|22|8|@]|D|@$9|23|A|24|1|25]]|E|$]]|$1|10|3|W|5|6|7|26|8|@]|D|@]|E|$]]|$1|11|3|12|5|6|7|27|8|@]|D|@]|E|$]]|$1|13|3|W|5|6|7|28|8|@]|D|@]|E|$]]|$1|14|3|Y|5|Z|7|29|8|@]|D|@$9|2A|A|2B|1|2C]]|E|$]]|$1|15|3|W|5|6|7|2D|8|@]|D|@]|E|$]]|$1|16|3|-4|5|6|7|2E|8|@]|D|@]|E|$]]]|17|$18|$5|19|1A|1B|E|$1C|1D|1E|-4]]|1F|$5|19|1A|1B|E|$1C|1G|1E|-4]]]]

<h3>Configure <code>&lt;error-page&gt;</code> Elements in <code>web.xml</code></h3>

Edit <code>$CATALINA_HOME/conf/web.xml</code>, add at the end the following <code>&lt;error-page&gt;</code>, save and restart tomcat

<pre><code>&lt;web-app&gt;

...
...
...

 &lt;error-page&gt;
 &lt;error-code&gt;404&lt;/error-code&gt;
 &lt;location&gt;/404.html&lt;/location&gt;
 &lt;/error-page&gt;

 &lt;error-page&gt;
 &lt;error-code&gt;500&lt;/error-code&gt;
 &lt;location&gt;/500.html&lt;/location&gt;
 &lt;/error-page&gt;

 &lt;error-page&gt;
 &lt;error-code&gt;400&lt;/error-code&gt;
 &lt;location&gt;/400.html&lt;/location&gt;
 &lt;/error-page&gt;

&lt;/web-app&gt;
</code></pre>

<ul>
<li>It works great as I expect even though I didn't actually created a valid routes for those specified <code>location</code> values (e.g. <code>/400.html</code>) </li>
</ul>

<hr>

before

<a href="https://i.stack.imgur.com/ACUwd.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ACUwd.png" alt="enter image description here"></a>

after

<a href="https://i.stack.imgur.com/JRVHO.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/JRVHO.png" alt="enter image description here"></a>

By default, Tomcat sends some HTML content back to the client if it encounters something like an HTTP 404. I know that via <code>web.xml</code> an <code>&lt;error-page&gt;</code> <a href="http://wiki.apache.org/tomcat/FAQ/Miscellaneous#Q6" rel="noreferrer">can be configured</a> to customize this content.

However, I'd just like for Tomcat to not send anything in terms of response content (I'd still like the status code, of course). Is there any way to easily configure this?

I'm trying to avoid A) explicitly sending empty content on the response stream from my Servlet, and B) configuring custom error pages for a whole bunch of HTTP error statuses in my <code>web.xml</code>.

For some background, I'm developing an HTTP API and am controlling my own response content. So for an HTTP 500, for example, I'm populating some XML content on the response containing error information. For situations like an HTTP 404, the HTTP response status is sufficient for clients, and the content tomcat is sending is unnecessary. If there's a different approach, I'm open to hearing it.

Edit:
After continued investigation, I still can't find much in the way of a solution. If someone can definitively say this is not possible, or provide a resource with evidence that it will not work, I'll accept that as an answer and try and work around it.

Disable all default HTTP error response content in Tomcat

翻译质量差，导致语言生硬或混乱。

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默认情况下，如果Tomcat遇到HTTP 404之类的东西，它会将一些HTML内容发送回客户端。我知道通过web.xml和<error-page> 来定制这个内容。但是，我只希望Tomcat在响应内容方面不发送任何(当然，我仍然需要状态代码)。有什么方法可以轻松地配置它吗？我试图避免A)显式地从我的Servlet在响应...

问禁用Tomcat中的所有默认HTTP错误响应内容
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