blocks|key|2994385|text|你检查绑定是IIS了吗？(inetmgr.exe)它可能无法注册为接受8080上的所有主机名。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2994386|例如，如果您为mysite.com:8080设置了IIS，并在localhost:8080命中它，则IIS将获得请求，但没有匹配的主机名绑定，因此它会拒绝。|2994387|除此之外，您应该检查服务器上的IIS日志(C:\inetpub\logs\wmsvc#)，看看是否看到您的请求。然后你就会知道这是你的客户端的问题，还是服务器本身的问题。|2994388|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Did you check the binding is IIS? (inetmgr.exe) It may not be registered to accept all hostnames on 8080.

For example, if you set it up for mysite.com:8080 and hit it at localhost:8080, IIS will get the request but not have a hostname binding to match so it rejects.

Outside of that, you should check the IIS logs (C:\inetpub\logs\wmsvc#) on the server and see if you are seeing your request. Then you'll know if its a problem on your client or on the server itself.

blocks|key|2994434|text|FWIW，如果你想只允许发送到任何主机名/ip的请求，那么你可以这样设置你的绑定：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2994435|<binding+protocol="http"+bindingInformation="*:80:*"+/>|code-block|syntax|javascript|2994436|我使用这个绑定，以便可以使用IE6加载VM，然后调试我的应用程序。|2994437|2994438|编辑:使用IIS+Express进行调试时，此选项的配置文件的默认位置为|2994439|C:\Users\{User}\Documents\IISExpress\config\applicationhost.config|2994440|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Q|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|R|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|S|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|T|8|@]|9|@]|A|$]]|$1|L|3|M|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|N|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|O|$]]

FWIW, if you'd like to just allow requests directed to any hostname/ip then you can set your binding like so:

<pre><code>&lt;binding protocol="http" bindingInformation="*:80:*" /&gt;
</code></pre>

I use this binding so that I can load a VM with IE6 and then debug my application.

<hr>

EDIT: While using IIS Express to debug, the default location for this option's config file is

<pre><code>C:\Users\{User}\Documents\IISExpress\config\applicationhost.config
</code></pre>

blocks|key|280337|text|微软的This页介绍了如何设置从本地网络上的其他计算机访问IIS+Server+Express。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|280338|简而言之：|280339|1)在具有管理员权限的命令提示符下：|280340|netsh+http+add+urlacl+url=http://[your+ip+address]:8181/+user=everyone|code-block|syntax|javascript|280341|2)在具有高级安全性的Windows防火墙中，为端口8181创建新的入站规则以允许外部连接|280342|3)在applicationhost.config中，在项目所在的节点中，添加：|280343|<binding+protocol="http"+bindingInformation="*:8181:[your+ip+address]"+/>|style|CODE|280344|不要添加(正如另一个答案中建议的那样)：|280345|<binding+protocol="http"+bindingInformation="*:8181:*"+/>|280346|上面的通配符绑定中断了我对http://192.168.1.6:8181/的访问|280347|entityMap|0|LINK|mutability|MUTABLE|url|http://www.iis.net/learn/extensions/using-iis-express/handling-url-binding-failures-in-iis-express^0|3|4|0|0|0|0|0|0|0|0|21|0|0|0|1L|0|D|O|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@$A|19|B|1A|1|1B]]|C|$]]|$1|D|3|E|5|6|7|1C|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|1D|8|@]|9|@]|C|$]]|$1|H|3|I|5|J|7|1E|8|@]|9|@]|C|$K|L]]|$1|M|3|N|5|6|7|1F|8|@]|9|@]|C|$]]|$1|O|3|P|5|6|7|1G|8|@]|9|@]|C|$]]|$1|Q|3|R|5|6|7|1H|8|@$A|1I|B|1J|S|T]]|9|@]|C|$]]|$1|U|3|V|5|6|7|1K|8|@]|9|@]|C|$]]|$1|W|3|X|5|6|7|1L|8|@$A|1M|B|1N|S|T]]|9|@]|C|$]]|$1|Y|3|Z|5|6|7|1O|8|@$A|1P|B|1Q|S|T]]|9|@]|C|$]]|$1|10|3|-4|5|6|7|1R|8|@]|9|@]|C|$]]]|11|$12|$5|13|14|15|C|$16|17]]]]

<a href="http://www.iis.net/learn/extensions/using-iis-express/handling-url-binding-failures-in-iis-express">This</a> page by Microsoft describes how to set up access to IIS Server Express from other computers on the local network.

In a nutshell:

1) from a command prompt with admin privileges:

<pre><code>netsh http add urlacl url=http://[your ip address]:8181/ user=everyone
</code></pre>

2) In Windows Firewall with Advanced Security, create a new inbound rule for port 8181 to allow external connections

3) In applicationhost.config, in the node for your project, add:

<code>&lt;binding protocol="http" bindingInformation="*:8181:[your ip address]" /&gt;</code>

Do NOT add (as was suggested in another answer):

<code>&lt;binding protocol="http" bindingInformation="*:8181:*" /&gt;</code>

The above wildcard binding broke my access from <code>http://192.168.1.6:8181/</code>

blocks|key|2994562|text|因此，我在IIS管理器中转到我的网站并将站点绑定中的主机名从localhost更改为*，从而解决了这个问题。立即开始工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2994563|​|2994564|📷|atomic|offset|length|2994565|2994566|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/f2ae6926f868989d2666aee09a96efad.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

So, I solved this by going to my website in IIS Manager and changing the host name in site bindings from localhost to *. Started working immediately. 

<a href="https://i.stack.imgur.com/zjsur.png" rel="noreferrer"><img src="https://i.stack.imgur.com/zjsur.png" alt="Site Bindings in IIS"></a>

blocks|key|282603|text|对于Visual+Studio+2017和Visual+Studio+2015，IIS+Express设置存储在隐藏的.vs目录中，路径类似于此.vs\config\applicationhost.config，添加如下所示的绑定将起作用|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|282604|<bindings>
++++<binding+protocol="http"+bindingInformation="*:8802:localhost"+/>
++++<binding+protocol="http"+bindingInformation="*:8802:127.0.0.1"+/>
</bindings>|code-block|syntax|javascript|282605|语法：https://docs.microsoft.com/en-us/dotnet/api/microsoft.web.administration.binding.bindinginformation?view=iis-dotnet|282606|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.microsoft.com/en-us/dotnet/api/microsoft.web.administration.binding.bindinginformation?view=iis-dotnet^0|2|I|L|I|14|B|1N|3|20|X|0|0|3|37|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]|$9|Z|A|10|B|C]|$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|15|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|16|8|@]|D|@$9|17|A|18|1|19]]|E|$]]|$1|M|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

For <code>Visual Studio 2017</code> and <code>Visual Studio 2015</code>, <code>IIS Express</code> settings is stored in the hidden <code>.vs</code> directory and the path is something like this <code>.vs\config\applicationhost.config</code>, add binding like below will work
<pre><code>&lt;bindings&gt;
 &lt;binding protocol=&quot;http&quot; bindingInformation=&quot;*:8802:localhost&quot; /&gt;
 &lt;binding protocol=&quot;http&quot; bindingInformation=&quot;*:8802:127.0.0.1&quot; /&gt;
&lt;/bindings&gt;
</code></pre>
Syntax:
<a href="https://docs.microsoft.com/en-us/dotnet/api/microsoft.web.administration.binding.bindinginformation?view=iis-dotnet" rel="nofollow noreferrer">https://docs.microsoft.com/en-us/dotnet/api/microsoft.web.administration.binding.bindinginformation?view=iis-dotnet</a>

blocks|key|286113|text|也不要忘记绑定到IPv6地址！我试图使用localhost在127.0.0.1上添加一个站点，得到错误的请求/无效的主机名错误。当我pinged本地主机时，它被解析为::1，因为IPv6被启用了，所以我只需要添加额外的绑定来修复这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|286114|​|286115|📷|atomic|offset|length|286116|286117|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/b118a3fa11ec38dc811a47c0ee83ac74.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

Don't forget to bind to the IPv6 address as well! I was trying to add a site on 127.0.0.1 using localhost and got the bad request/invalid hostname error. When I pinged localhost it resolved to ::1 since IPv6 was enabled so I just had to add the additional binding to fix the issue.

<a href="https://i.stack.imgur.com/M0bRk.png" rel="noreferrer"><img src="https://i.stack.imgur.com/M0bRk.png" alt="IIS Site Bindings"></a>

blocks|key|3208035|text|这解决了我的问题(为我糟糕的英语道歉)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3208036|3208037|以管理员身份打开cmd并运行命令(不带方括号)：|ordered-list-item|3208038|3208039|netsh+http+add+urlacl+url=http://[ip+adress]:[port]/+user=everyone|offset|length|style|CODE|3208040|3208041|在documents/iisexpress/config/applicationhost.config和根项目文件夹中的(隐藏的)文件夹中：.vs/config/applicationhost.config您需要在"site“标记中添加行：|3208042|3208043|<binding+protocol="http"+bindingInformation="*:8080:192.xxx.xxx.xxx"+/>|3208044|3208045|打开“因特网信息服务(iis)管理器”|3208046|3208047|(要找到它:在任务栏中搜索，写上“打开或关闭窗口功能”并打开结果，然后选中“互联网信息服务”复选框并安装它)：|3208048|1.+in+left+screen+click:+computer-name+-->+Sites+-->+Default+Web+Site+and
2.+then+click+in+right+screen+"Binding"
3.+click+Add+button
4.+write+what+you+need+and+press+"OK".|code-block|syntax|javascript|3208049|3208050|打开“具有高级安全性的Windows防火墙”，|3208051|3208052|1.+in+left+screen+press+"Inbound+Rules"+and+then
2.+press+in+right+screen+"New+Rule..."
3.+check+port+and+press+Next,
4.+check+TCP+and+your+port+and+press+Next,
5.+check+"Allow+the+connection"+and+press+Next,
6.+check+all+checkbox+and+press+Next,
7.+write+name+and+press+Finish.|3208053|3208054|done.|3208055|3208056|entityMap^0|0|0|0|0|0|1U|0|0|1|1E|1Y|X|0|0|0|1Z|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1F|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|1H|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|1J|8|@$I|1K|J|1L|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|1M|8|@]|9|@]|A|$]]|$1|N|3|O|5|E|7|1N|8|@$I|1O|J|1P|K|L]|$I|1Q|J|1R|K|L]]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1S|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1T|8|@$I|1U|J|1V|K|L]]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1W|8|@]|9|@]|A|$]]|$1|T|3|U|5|E|7|1X|8|@]|9|@]|A|$]]|$1|V|3|-4|5|6|7|1Y|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|10|7|20|8|@]|9|@]|A|$11|12]]|$1|13|3|-4|5|6|7|21|8|@]|9|@]|A|$]]|$1|14|3|15|5|E|7|22|8|@]|9|@]|A|$]]|$1|16|3|-4|5|6|7|23|8|@]|9|@]|A|$]]|$1|17|3|18|5|10|7|24|8|@]|9|@]|A|$11|12]]|$1|19|3|-4|5|6|7|25|8|@]|9|@]|A|$]]|$1|1A|3|1B|5|E|7|26|8|@]|9|@]|A|$]]|$1|1C|3|-4|5|6|7|27|8|@]|9|@]|A|$]]|$1|1D|3|-4|5|6|7|28|8|@]|9|@]|A|$]]]|1E|$]]

This solved my problem (sorry for my bad English):
<ol>
<li>open cmd as administrator and run command (Without the square brackets): 
<code>netsh http add urlacl url=http://[ip adress]:[port]/ user=everyone</code>
</li>
<li>in <code>documents/iisexpress/config/applicationhost.config</code> and in your root project folder in (hidden) folder: <code>.vs/config/applicationhost.config</code> you need add row to &quot;site&quot; tag: 
<code>&lt;binding protocol=&quot;http&quot; bindingInformation=&quot;*:8080:192.xxx.xxx.xxx&quot; /&gt;</code>
</li>
<li>open &quot;internet information services (iis) manager&quot; 
(to find it: in search in taskbar write &quot;Turn Window features on or off&quot; and open result and then check the checkbox &quot;internet information service&quot; and install that):
<ol>
<li>in left screen click: computer-name --&gt; Sites --&gt; Default Web Site and</li>
<li>then click in right screen &quot;Binding&quot;</li>
<li>click Add button</li>
<li>write what you need and press &quot;OK&quot;.</li>
</ol>
</li>
<li>open &quot;Windows Firewall With Advanced Security&quot;,
<ol>
<li>in left screen press &quot;Inbound Rules&quot; and then</li>
<li>press in right screen &quot;New Rule...&quot;</li>
<li>check port and press Next,</li>
<li>check TCP and your port and press Next,</li>
<li>check &quot;Allow the connection&quot; and press Next,</li>
<li>check all checkbox and press Next,</li>
<li>write name and press Finish.</li>
</ol>
</li>
<li>done.
</li>
</ol>

blocks|key|3207782|text|我不确定这是不是你的问题，但对于任何试图从他的机器访问他的web应用程序的人来说，都有这个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3207783|确保您连接的是127.0.0.1+(也称为localhost)，而不是您的外部IP地址。|offset|length|style|CODE|3207784|你的网址应该类似于http://localhost:8181/或http://127.0.0.1:8181和，而不是+http://YourExternalIPaddress:8181/。|BOLD|3207785|​|3207786|3207787|更多信息：|3207788|这样做的原因是您的防火墙可能会阻止您自己的请求。它可以是你操作系统上的防火墙，也可以是(通常)你的路由器。|3207789|3207790|当你连接到你的外部IP地址时，你从互联网连接到你，就像你是一个陌生人(或黑客)一样。|3207791|但是，当您连接到本地主机时，您作为自己在本地连接，显然不需要块(&完全避免)。|3207792|entityMap^0|0|7|9|L|9|0|9|M|W|L|1N|Y|1I|4|0|0|0|0|5|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@$D|10|E|11|F|G]|$D|12|E|13|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|14|8|@$D|15|E|16|F|G]|$D|17|E|18|F|G]|$D|19|E|1A|F|G]|$D|1B|E|1C|F|J]]|9|@]|A|$]]|$1|K|3|L|5|6|7|1D|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|1F|8|@$D|1G|E|1H|F|J]]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1I|8|@]|9|@]|A|$]]|$1|R|3|L|5|6|7|1J|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1K|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1L|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1M|8|@]|9|@]|A|$]]]|X|$]]

I'm not sure if this was your problem but for anyone that's trying to access his web application from his machine and having this problem:

Make sure you're connecting to <code>127.0.0.1</code> (a.k.a <code>localhost</code>) and not to your external IP address.

Your URL should be something like <code>http://localhost:8181/</code> or <code>http://127.0.0.1:8181</code> and not <code>http://YourExternalIPaddress:8181/</code>.

<hr />
Additional information: 
The reason this works is because your firewall may block your own request. It can be a firewall on your OS and it can be (the usual) your router.

When you connect to your external IP address, you connect to you from the internet, as if you were a stranger (or a hacker). 
However when you connect to your localhost, you connect locally as yourself and the block is obviously not needed (&amp; avoided altogether).

blocks|key|2994796|text|如果在本地服务器上工作，或者您没有域名，请删除"Host+Name:“字段。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2994797|📷|atomic|offset|length|2994798|​|2994799|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/16e4d1b398d14348e06815d621953a7e.png|imageAlt^0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|S|8|@]|9|@$E|T|F|U|1|V]]|A|$]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P|Q|-4]]]]

If working on local server or you haven't got domain name, delete "Host Name:" field.
 <a href="https://i.stack.imgur.com/JgPw2.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/JgPw2.png" alt="enter image description here"></a>

blocks|key|283928|text|您可以使用Visual+Studio+2005/2008/2010+CMD工具。以admin身份运行它，并编写|type|unstyled|depth|inlineStyleRanges|entityRanges|data|283929|aspnet_regiis+-i|code-block|syntax|javascript|283930|终于，我可以成功地运行我的应用程序了。|283931|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You can use Visual Studio 2005/2008/2010 CMD tool. Run it as admin, and write

<pre><code>aspnet_regiis -i
</code></pre>

At last I can run my app successfully.

blocks|key|3207810|text|检查您的本地主机文件(例如C：\Windows\System32\drivers\etc\+hosts+)。在我的例子中，我以前使用它来指向一个开发框的URL，然后忘记了它。然后，当我重用相同的URL时，我一直收到错误的请求(无效的主机名)，因为流量去往错误的服务器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3207811|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Check your local hosts file (C:\Windows\System32\drivers\etc\hosts for example). In my case I had previously used this to point a URL to a dev box and then forgotten about it. When I then reused the same URL I kept getting Bad Request (Invalid Hostname) because the traffic was going to the wrong server.

blocks|key|280329|text|当我试图使用"localhost“调用when服务时，我得到了这个错误。我用实际的IP修复了它(192.168...)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|280330|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I got this error when I tried to call a webservice using "localhost". I fixed it by using the actual IP instead (192.168...)

blocks|key|2994533|text|在使用msdeploy将应用程序复制到新服务器后，我看到了相同的错误。结果是，绑定仍然使用以前服务器上的IP地址。因此，请仔细检查IIS绑定中的IP地址。(在事实发生后似乎很明显，但我没有立即想到去检查它)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2994534|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I saw the same error after using msdeploy to copy the application to a new server. It turned out that the bindings were still using the IP address from the previous server. So, double check IP address in the IIS bindings. (Seems obvious after the fact, but did not immediately occur to me to check it).

blocks|key|2994736|text|仔细检查您提供的确切URL。当我错过了ASP.NET中定义的路由前缀时，我看到了这个错误，因此它不知道将请求路由到哪里。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2994737|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Double check the exact URL you're providing.
I saw this error when I missed off the route prefix defined in ASP.NET so it didn't know where to route the request.

blocks|key|284120|text|确保IIS正在侦听您的端口。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|284121|在我的例子中，这就是问题所在。因此，我不得不将我的端口更改为其他端口，比如8083，它解决了这个问题。|284122|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Make sure IIS is listening to your port.

In my case this was the issue. So I had to change my port to something else like 8083 and it solved this issue.

blocks|key|2994836|text|我也有这个问题，但它与我的应用程序配置的AllowedHosts有关|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2994837|如果它是一个.Net应用程序，您可能应该让appsettings.json查看它的AllowedHosts，并尝试将其更改为all-allowed+"*"|offset|length|style|BOLD|2994838|{
++++"Logging":+{
++++++++"LogLevel":+{
++++++++++++"Default":+"Information",
++++++++++++"Microsoft":+"Warning",
++++++++++++"Microsoft.Hosting.Lifetime":+"Information"
++++++++}
++++},
++++"AllowedHosts":+"*",
}|code-block|syntax|javascript|2994839|因此，如果AllowedHosts值不正确，也会出现BarRequest错误|2994840|entityMap^0|0|L|G|22|3|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@$D|S|E|T|F|G]|$D|U|E|V|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|W|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|P|$]]

I also had this issue, but it was related to AllowedHosts of my application configuration
If it's a .Net application you should probably have appsettings.json
Have a look of it's AllowedHosts and try to change it to all-allowed &quot;*&quot;
<pre><code>{
 &quot;Logging&quot;: {
 &quot;LogLevel&quot;: {
 &quot;Default&quot;: &quot;Information&quot;,
 &quot;Microsoft&quot;: &quot;Warning&quot;,
 &quot;Microsoft.Hosting.Lifetime&quot;: &quot;Information&quot;
 }
 },
 &quot;AllowedHosts&quot;: &quot;*&quot;,
}
</code></pre>
So in case of incorrect AllowedHosts value, you will also have BarRequest error

When I try to hit my web app on port 8080 I get the following error

<blockquote>
 Bad Request - Invalid Hostname 
 HTTP Error 400. The request hostname is invalid.
</blockquote>

I don't even know where to begin to diagnose this problem

Bad Request - Invalid Hostname IIS7

当我尝试在端口8080上访问我的web应用程序时，我得到了以下错误错误请求-主机名无效HTTP错误400。请求主机名无效。我甚至不知道从哪里开始诊断这个问题

问错误请求-主机名IIS7无效
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