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本文介紹了文件 URL “不允許加載本地資源"在 Internet 瀏覽器中的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！

問題描述

我有一個重要的腦筋急轉彎.

我想用經典的 ASP 打開一個文件.我正在使用各種變量，因為事情可能會改變，但結果是正確的.我知道這一點是因為我已經通過復制鏈接地址并將其放在我的 URL 中來測試結果.現在的問題是:如果我點擊我的鏈接，它不會做任何事情.不是刷新，不是重定向.沒有什么.有誰知道我做錯了什么?

好的，這就是交易.我的文件并不總是本地的，這取決于我所處的環境.如果我復制粘貼我的網址的結果，它會下載.如果我單擊我的 URL，它不會響應.有任何想法嗎?瀏覽器問題?(雖然我已經測試了 5 個瀏覽器)還是別的什么?我真的被困在這里，互聯網似乎不在我這邊.

我有 3 個環境.這里下面的變量是為了使鏈接有效.我知道該鏈接有效，因為我已經通過復制對其進行了測試.是的，它確實以 file:/// 開頭，是的，我確定鏈接是正確的.

這是我的代碼行:

response.write("<td class='tab_kolom2'><a href='"&rootRs("pre_rootpad")&rootRs("rootpad_protocollen")&""&overzichtRs("Formuliernr")&"Uitvoeringsoverzicht.xls' target='_blank' 下載>點擊這里</a></td>")

<小時>

帶有錯誤/鏈接結果的屏幕截圖

解決方案

現在我們知道實際的錯誤是什么，可以制定答案了.

<塊引用>

不允許加載本地資源

是 Chrome 和其他現代瀏覽器中內置的安全異常.措辭可能不同，但在某種程度上，它們都有安全例外來處理這種情況.

過去您可以覆蓋某些設置或應用某些標志，例如

<上一頁>--disable-web-security --allow-file-access-from-files --allow-file-access

在 Chrome 中(參見 https://stackoverflow.com/a/22027002/692942)

<塊引用>

它的存在是有原因的

盡管在這一點上值得指出，這些安全異常的存在是有充分理由的，試圖規避它們并不是最好的主意.

還有一種方法

由于您已經可以訪問 Classic ASP，因此您始終可以構建一個為基于網絡的文件提供服務的中間頁面.您可以結合使用 ADODB.Stream 對象和 Response.BinaryWrite() 方法來執行此操作.這樣做可確保您的網絡文件位置永遠不會暴露給客戶端，并且由于腳本的靈活性，它可用于從多個位置和多種文件類型加載資源.

這是一個基本示例(getfile.asp"):

<%選項顯式Dim s, id, bin, file, 文件名, mimeid = Request.QueryString(id")'id 可以是任何東西，只需將其用作識別'文件返回.這可能是一個像這樣的簡單案例陳述'甚至從數據庫中提取.選擇案例編號案例TESTFILE1"'文件、mime 和文件名無論如何都可以建立'必須進行硬編碼.文件 = \servershareProjectenProtocollen346Uitvoeringsoverzicht.xls"mime =應用程序/vnd.ms-excel"；'下載資源時要顯示的文件名.文件名=Uitvoeringsoverzicht.xls"；'假設其他文件案件 ...結束選擇如果 Len(file & ">)0 然后設置 s = Server.CreateObject("ADODB.Stream")s.Type = adTypeBinary 'adTypeBinary = 1 見有用的鏈接"調用 s.Open()調用 s.LoadFromFile(file)bin = s.Read()'清理流并釋放內存調用 s.Close()設置 s = 無'根據 mime 變量設置內容類型頭Response.ContentType = mime'控制如何使用'內容處置 HTTP 標頭.使用附件"強制資源'在內聯"時提示客戶端下載允許資源'下載并在客戶端顯示(用于返回圖片'作為'src'一個<img>標簽).調用 Response.AddHeader("Content-Disposition", "attachment;filename="; & filename)調用 Response.BinaryWrite(bin)別的'如果沒有文件，則返回 404.Response.Status = 404 Not Found"萬一%>

^{這個例子是偽編碼的，因此未經測試.}

然后可以像這樣在 <a> 中使用這個腳本來返回資源；

<a href="/getfile.asp?id=TESTFILE1">點擊這里</a>

可以進一步采用這種方法并考慮(尤其是對于較大的文件)使用Response.IsConnected分塊讀取文件以檢查客戶端是否仍然存在并且s.EOS 屬性用于在讀取塊時檢查流的結尾.您還可以添加到查詢字符串參數以設置是否希望文件返回內聯或提示下載.

有用的鏈接

使用 METADATA 導入 DLL 常量 - 如果您無法識別 adTypeBinary，總是比硬編碼 1 更好.
Content-Disposition:inline"和attachment"有什么區別? - 有用信息關于 Content-Disposition 在客戶端上的行為方式.

I've got a major brainteaser.

I want to open a file in classic ASP. I'm using various variables because things can change but the outcome is correct. I know this because I've tested the outcome by copying the linkadress and placing it in my URL. Now the problem: If I click my link it doesn't do anything. Not a refresh, not a redirect. nothing. Does anyone know what I did wrong?

Ok here's the deal. My file isn't always local, it depends on what environment I'm on. If I copy-paste the outcome of my url it does download. If I click my URL it doesn't respond. Any ideas? Browser problem? (although I've tested 5 browsers) Or anything else? I'm really stuck here and the internet does not seem to be on my side.

I've got 3 environments. The variables underneath here are so that the link works. I know the link works because I've tested it by copying. And yes, it does begin with file:/// and yes I'm sure the link is right.

Here's my line of code:

response.write("<td class='tab_kolom2'><a href='"&rootRs("pre_rootpad")&rootRs("rootpad_protocollen")&""&overzichtRs("Formuliernr")&"Uitvoeringsoverzicht.xls' target='_blank' download>Click here</a></td>")

EDIT: Screenshot with error/outcome of link

解決方案

Now we know what the actual error is can formulate an answer.

Not allowed to load local resource

is a Security exception built into Chrome and other modern browsers. The wording may be different but in some way shape or form they all have security exceptions in place to deal with this scenario.

In the past you could override certain settings or apply certain flags such as

--disable-web-security --allow-file-access-from-files --allow-file-access

in Chrome (See https://stackoverflow.com/a/22027002/692942)

It's there for a reason

At this point though it's worth pointing out that these security exceptions exist for good reason and trying to circumvent them isn't the best idea.

There is another way

As you have access to Classic ASP already you could always build a intermediary page that serves the network based files. You do this using a combination of the ADODB.Stream object and the Response.BinaryWrite() method. Doing this ensures your network file locations are never exposed to the client and due to the flexibility of the script it can be used to load resources from multiple locations and multiple file types.

Here is a basic example ("getfile.asp"):

<%
Option Explicit

Dim s, id, bin, file, filename, mime

id = Request.QueryString("id")

'id can be anything just use it as a key to identify the 
'file to return. It could be a simple Case statement like this
'or even pulled from a database.
Select Case id
Case "TESTFILE1"
  'The file, mime and filename can be built-up anyway they don't 
  'have to be hard coded.
  file = "\servershareProjectenProtocollen346Uitvoeringsoverzicht.xls"     
  mime = "application/vnd.ms-excel"
  'Filename you want to display when downloading the resource.
  filename = "Uitvoeringsoverzicht.xls"

'Assuming other files 
Case ...
End Select

If Len(file & "") > 0 Then
  Set s = Server.CreateObject("ADODB.Stream")
  s.Type = adTypeBinary 'adTypeBinary = 1 See "Useful Links"
  Call s.Open()
  Call s.LoadFromFile(file)
  bin = s.Read()

  'Clean-up the stream and free memory
  Call s.Close()
  Set s = Nothing

  'Set content type header based on mime variable
  Response.ContentType = mime
  'Control how the content is returned using the 
  'Content-Disposition HTTP Header. Using "attachment" forces the resource
  'to prompt the client to download while "inline" allows the resource to
  'download and display in the client (useful for returning images
  'as the "src" of a <img> tag).
  Call Response.AddHeader("Content-Disposition", "attachment;filename=" & filename)
  Call Response.BinaryWrite(bin)
Else
  'Return a 404 if there's no file.
  Response.Status = "404 Not Found"
End If
%>

^{This example is pseudo coded and as such is untested.}

This script can then be used in <a> like this to return the resource;

<a href="/getfile.asp?id=TESTFILE1">Click Here</a>

The could take this approach further and consider (especially for larger files) reading the file in chunks using Response.IsConnected to check whether the client is still there and s.EOS property to check for the end of the stream while the chunks are being read. You could also add to the querystring parameters to set whether you want the file to return in-line or prompt to be downloaded.

Useful Links

Using METADATA to Import DLL Constants - If you are having trouble getting adTypeBinary to be recongnised, always better then just hard coding 1.
Content-Disposition:What are the differences between "inline" and "attachment"? - Useful information about how Content-Disposition behaves on the client.

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文件 URL “不允許加載本地資源"在 Internet 瀏

問題描述

還有一種方法

有用的鏈接

There is another way

Useful Links

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