blocks|key|2951647|text|试试ETag:+"4ae413bd"。ETag的值必须遵循ABNF格式：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2951648|++entity-tag+=+[+weak+]+opaque-tag
++weak+++++++=+"W/"
++opaque-tag+=+quoted-string

++quoted-string++=+(+<">+*(qdtext+%7C+quoted-pair+)+<">+)
++qdtext+++++++++=+<any+TEXT+except+<">>
++quoted-pair++++=+"\"+CHAR
++CHAR+++++++++++=+<any+US-ASCII+character+(octets+0+-+127)>
++TEXT+++++++++++=+<any+OCTET+except+CTLs,+but+including+LWS>
++OCTET++++++++++=+<any+8-bit+sequence+of+data>
++LWS++++++++++++=+[CRLF]+1*(+SP+%7C+HT+)
++CTL++++++++++++=+<any+US-ASCII+control+character+(octets+0+-+31)+and+DEL+(127)>
++CRLF+++++++++++=+CR+LF
++CR+++++++++++++=+<US-ASCII+CR,+carriage+return+(13)>
++LF+++++++++++++=+<US-ASCII+LF,+linefeed+(10)>
++SP+++++++++++++=+<US-ASCII+SP,+space+(32)>
++HT+++++++++++++=+<US-ASCII+HT,+horizontal-tab+(9)>|code-block|syntax|javascript|2951649|，它基本上是常规正则表达式中的([wW]/)?"([%5E"]%7C\\")*"。|2951650|请注意，"\"和"/"都是etags的有效值。|2951651|参考文献：section-14.19，section-3.11，section-2.2。|2951652|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Augmented_Backus%25E2%2580%2593Naur_Form|1|http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.19|2|http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.11|3|http://www.w3.org/Protocols/rfc2616/rfc2616-sec2.html#sec2.2^0|2|G|T|4|0|0|0|F|L|0|4|3|8|3|0|5|D|1|J|C|2|W|B|3|0^^$0|@$1|2|3|4|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@$9|17|A|18|1|19]]|E|$]]|$1|F|3|G|5|H|7|1A|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1B|8|@$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|1E|8|@$9|1F|A|1G|B|C]|$9|1H|A|1I|B|C]]|D|@]|E|$]]|$1|O|3|P|5|6|7|1J|8|@]|D|@$9|1K|A|1L|1|1M]|$9|1N|A|1O|1|1P]|$9|1Q|A|1R|1|1S]]|E|$]]|$1|Q|3|-4|5|6|7|1T|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]|Y|$5|T|U|V|E|$W|Z]]|10|$5|T|U|V|E|$W|11]]|12|$5|T|U|V|E|$W|13]]]]

Try <code>ETag: "4ae413bd"</code>.
The value of an ETag must follow the <a href="http://en.wikipedia.org/wiki/Augmented_Backus%E2%80%93Naur_Form" rel="noreferrer">ABNF</a> form:

<pre><code> entity-tag = [ weak ] opaque-tag
 weak = "W/"
 opaque-tag = quoted-string

 quoted-string = ( &lt;"&gt; *(qdtext | quoted-pair ) &lt;"&gt; )
 qdtext = &lt;any TEXT except &lt;"&gt;&gt;
 quoted-pair = "\" CHAR
 CHAR = &lt;any US-ASCII character (octets 0 - 127)&gt;
 TEXT = &lt;any OCTET except CTLs, but including LWS&gt;
 OCTET = &lt;any 8-bit sequence of data&gt;
 LWS = [CRLF] 1*( SP | HT )
 CTL = &lt;any US-ASCII control character (octets 0 - 31) and DEL (127)&gt;
 CRLF = CR LF
 CR = &lt;US-ASCII CR, carriage return (13)&gt;
 LF = &lt;US-ASCII LF, linefeed (10)&gt;
 SP = &lt;US-ASCII SP, space (32)&gt;
 HT = &lt;US-ASCII HT, horizontal-tab (9)&gt;
</code></pre>

, which is basically <code>([wW]/)?"([^"]|\\")*"</code> in regular regex.

Note that both <code>"\"</code> and <code>"/"</code> are valid values for etags.

References: <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.19" rel="noreferrer">section-14.19</a>, <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.11" rel="noreferrer">section-3.11</a>, <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec2.html#sec2.2" rel="noreferrer">section-2.2</a>.

blocks|key|258947|text|正如Arnaud提到的，确保您引用了该值。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|258948|替换|258949|new+EntityTagHeaderValue("0");|code-block|syntax|javascript|258950|使用|258951|new+EntityTagHeaderValue("\"0\"");|258952|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

As Arnaud mentioned, make sure that you have quoted the value.

replace

<pre><code>new EntityTagHeaderValue("0");
</code></pre>

with

<pre><code>new EntityTagHeaderValue("\"0\"");
</code></pre>

blocks|key|2951634|text|“ETag是一种不透明的标识符，由web服务器分配给在URL中找到的资源的特定版本”。这意味着它可以是几乎任何东西。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2951635|问题可能出在语法上，请使用：|2951636|ETag:+"4ae413bd"|code-block|syntax|javascript|2951637|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

"An ETag is an opaque identifier assigned by a web server to a specific version of a resource found at a URL". This means it can be pretty much anything.

The problem is probably the syntax, use:

<pre><code>ETag: "4ae413bd"
</code></pre>

blocks|key|261228|text|如果您因为下面的堆栈跟踪而到达此处，请确保在Visual+Studio中取消选中导致此错误的"Enable+Browser+Link“选项：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|261229|📷|atomic|offset|length|261230|​|261231|Conversion>+[13:31:10+ERR]+Connection+id+"0HLJ153E20LDJ",+Request+id+"0HLJ153E20LDJ:00000003":+An+unhandled+exception+was+thrown+by+the+application.
Conversion>+System.ObjectDisposedException:+The+response+has+been+aborted+due+to+an+unhandled+application+exception.+--->+System.FormatException:+Invalid+ETag+name
Conversion>++++at+Microsoft.Net.Http.Headers.EntityTagHeaderValue..ctor(StringSegment+tag,+Boolean+isWeak)
Conversion>++++at+Microsoft.Net.Http.Headers.EntityTagHeaderValue..ctor(StringSegment+tag)
Conversion>++++at+Microsoft.VisualStudio.Web.BrowserLink.BrowserLinkMiddleWareUtil.AddToETag(ResponseHeaders+responseHeader,+Int32+port)
Conversion>++++at+Microsoft.VisualStudio.Web.BrowserLink.BrowserLinkMiddleware.<>c__DisplayClass7_0.<ExecuteWithFilter>b__0()
Conversion>++++at+Microsoft.AspNetCore.Http.HttpResponse.<>c.<.cctor>b__30_0(Object+callback)
Conversion>++++at+Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.FireOnStartingMayAwait(Stack`1+onStarting)
Conversion>++++---+End+of+inner+exception+stack+trace+---
Conversion>++++at+Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ThrowResponseAbortedException()
Conversion>++++at+Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.InitializeResponseAsync(Int32+firstWriteByteCount)
Conversion>++++at+Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.WriteAsync(ReadOnlyMemory`1+data,+CancellationToken+cancellationToken)
Conversion>++++at+Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpResponseStream.WriteAsync(Byte[]+buffer,+Int32+offset,+Int32+count,+CancellationToken+cancellationToken)
Conversion>++++at+System.IO.Stream.WriteAsync(Byte[]+buffer,+Int32+offset,+Int32+count)
Conversion>++++at+Microsoft.VisualStudio.Web.BrowserLink.ScriptInjectionFilterStream.<>c__DisplayClass37_0.<<CreateResponseHandler>b__0>d.MoveNext()
Conversion>+---+End+of+stack+trace+from+previous+location+where+exception+was+thrown+---
Conversion>++++at+Microsoft.VisualStudio.Web.BrowserLink.SocketReader.ReadBytesIntoResponseHandler(Int64+totalBytesToRead,+ResponseHandler+handler,+CancellationToken+cancellationToken)
Conversion>++++at+Microsoft.VisualStudio.Web.BrowserLink.HttpSocketAdapter.ResponseReader.ReadBytesIntoResponse(Int64+bytesToRead)
Conversion>++++at+Microsoft.VisualStudio.Web.BrowserLink.HttpSocketAdapter.ResponseReader.ReadChunkedContent()
Conversion>++++at+Microsoft.VisualStudio.Web.BrowserLink.HttpSocketAdapter.ResponseReader.ReadResponse()
Conversion>++++at+Microsoft.VisualStudio.Web.BrowserLink.DelayConnectingHttpSocketAdapter.Microsoft.VisualStudio.Web.BrowserLink.IHttpSocketAdapter.WaitForResponseComplete()
Conversion>++++at+Microsoft.VisualStudio.Web.BrowserLink.ScriptInjectionFilterStream.WaitForFilterComplete()
Conversion>++++at+Microsoft.VisualStudio.Web.BrowserLink.BrowserLinkMiddleware.ExecuteWithFilter(IHttpSocketAdapter+injectScriptSocket,+String+requestId,+HttpContext+httpContext)
Conversion>++++at+Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext+context)
Conversion>++++at+Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext+context)
Conversion>++++at+Microsoft.AspNetCore.Server.IISIntegration.IISMiddleware.Invoke(HttpContext+httpContext)
Conversion>++++at+Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[TContext](IHttpApplication`1+application)|code-block|syntax|javascript|261232|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/e60403ff29505dfb59f4803e17cd618f.png|imageAlt^0|0|0|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@$E|Y|F|Z|1|10]]|A|$]]|$1|G|3|H|5|6|7|11|8|@]|9|@]|A|$]]|$1|I|3|J|5|K|7|12|8|@]|9|@]|A|$L|M]]|$1|N|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|U|V|-4]]]]

If you got here because of the stack trace below, make sure you uncheck the "Enable Browser Link" option in Visual Studio that causes this error : <a href="https://i.stack.imgur.com/cgQIT.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/cgQIT.png" alt="uncheck this"></a>

<pre><code>Conversion&gt; [13:31:10 ERR] Connection id "0HLJ153E20LDJ", Request id "0HLJ153E20LDJ:00000003": An unhandled exception was thrown by the application.
Conversion&gt; System.ObjectDisposedException: The response has been aborted due to an unhandled application exception. ---&gt; System.FormatException: Invalid ETag name
Conversion&gt; at Microsoft.Net.Http.Headers.EntityTagHeaderValue..ctor(StringSegment tag, Boolean isWeak)
Conversion&gt; at Microsoft.Net.Http.Headers.EntityTagHeaderValue..ctor(StringSegment tag)
Conversion&gt; at Microsoft.VisualStudio.Web.BrowserLink.BrowserLinkMiddleWareUtil.AddToETag(ResponseHeaders responseHeader, Int32 port)
Conversion&gt; at Microsoft.VisualStudio.Web.BrowserLink.BrowserLinkMiddleware.&lt;&gt;c__DisplayClass7_0.&lt;ExecuteWithFilter&gt;b__0()
Conversion&gt; at Microsoft.AspNetCore.Http.HttpResponse.&lt;&gt;c.&lt;.cctor&gt;b__30_0(Object callback)
Conversion&gt; at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.FireOnStartingMayAwait(Stack`1 onStarting)
Conversion&gt; --- End of inner exception stack trace ---
Conversion&gt; at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ThrowResponseAbortedException()
Conversion&gt; at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.InitializeResponseAsync(Int32 firstWriteByteCount)
Conversion&gt; at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.WriteAsync(ReadOnlyMemory`1 data, CancellationToken cancellationToken)
Conversion&gt; at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpResponseStream.WriteAsync(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken)
Conversion&gt; at System.IO.Stream.WriteAsync(Byte[] buffer, Int32 offset, Int32 count)
Conversion&gt; at Microsoft.VisualStudio.Web.BrowserLink.ScriptInjectionFilterStream.&lt;&gt;c__DisplayClass37_0.&lt;&lt;CreateResponseHandler&gt;b__0&gt;d.MoveNext()
Conversion&gt; --- End of stack trace from previous location where exception was thrown ---
Conversion&gt; at Microsoft.VisualStudio.Web.BrowserLink.SocketReader.ReadBytesIntoResponseHandler(Int64 totalBytesToRead, ResponseHandler handler, CancellationToken cancellationToken)
Conversion&gt; at Microsoft.VisualStudio.Web.BrowserLink.HttpSocketAdapter.ResponseReader.ReadBytesIntoResponse(Int64 bytesToRead)
Conversion&gt; at Microsoft.VisualStudio.Web.BrowserLink.HttpSocketAdapter.ResponseReader.ReadChunkedContent()
Conversion&gt; at Microsoft.VisualStudio.Web.BrowserLink.HttpSocketAdapter.ResponseReader.ReadResponse()
Conversion&gt; at Microsoft.VisualStudio.Web.BrowserLink.DelayConnectingHttpSocketAdapter.Microsoft.VisualStudio.Web.BrowserLink.IHttpSocketAdapter.WaitForResponseComplete()
Conversion&gt; at Microsoft.VisualStudio.Web.BrowserLink.ScriptInjectionFilterStream.WaitForFilterComplete()
Conversion&gt; at Microsoft.VisualStudio.Web.BrowserLink.BrowserLinkMiddleware.ExecuteWithFilter(IHttpSocketAdapter injectScriptSocket, String requestId, HttpContext httpContext)
Conversion&gt; at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)
Conversion&gt; at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)
Conversion&gt; at Microsoft.AspNetCore.Server.IISIntegration.IISMiddleware.Invoke(HttpContext httpContext)
Conversion&gt; at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[TContext](IHttpApplication`1 application)
</code></pre>

<a href="http://redbot.org" rel="noreferrer">Redbot</a> reports that my webpage has invalid header:

<blockquote>
 The ETag header's syntax isn't valid.
</blockquote>

My headers are set to:

<pre><code>ETag: 4ae413bd
</code></pre>

Why is it invalid?

What is the syntax for an ETag?

Syntax for ETag?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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报告我的网页标题无效： ETag标头的语法无效。我的邮件头设置为：ETag: 4ae413bd为什么是无效的？ETag的语法是什么？

问ETag的语法？
EN

回答 4

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