尝试使用ETag: "4ae413bd"
。
一个ETag的值必须遵循ABNF格式:
entity-tag = [ weak ] opaque-tag
weak = "W/"
opaque-tag = quoted-string
quoted-string = ( <"> *(qdtext | 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 | 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)>
这里的 <strong>ETag</strong>
基本上是正则表达式中的 ([wW]/)?"([^"]|\\" )*
。
请注意,"\"
和 "/"
都是有效的 etag 值。
正如Arnaud所提到的,确保您引用了该值。
替换
new EntityTagHeaderValue("0");
使用
new EntityTagHeaderValue("\"0\"");
ETag是由Web服务器分配给URL上找到的特定版本资源的不透明标识符。"这意味着它可以是几乎任何东西。
问题可能是语法,使用:
"ETag: "4ae413bd"
如果您因下面的堆栈跟踪而到达此处,请确保在Visual Studio中取消选中“启用浏览器链接”选项,该选项会导致此错误:
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)