如何顯示字節流響應

Question

我的REST API以字節爲單位返回PDF文檔，我需要調用該API並在ASP頁面上顯示PDF文檔以供用戶預覽。

我試圖

Response.Write HttpReq.responseBody 

但它寫在頁面上一些不可讀的文本。 httpReq是我通過其調用REST API的對象。 REST API的

響應：

Request.CreateResponse(HttpStatusCode.OK, pdfStream, MediaTypeHeaderValue.Parse("application/pdf")) 

Answer 1

在傳統的ASP，Response.Write()用於使用Response對象上定義的CodePage和Charset屬性文本數據發送回瀏覽器（默認情況下這是從繼承當前會話並通過擴展IIS服務器配置）。

發送二進制數據回瀏覽器使用Response.BinaryWrite()。

下面是一個簡單的例子（片斷基於關閉你已經具有從httpReq.ResponseBody二進制）;

<% 
Response.ContentType = "application/pdf" 
'Make sure nothing in the Response buffer. 
Call Response.Clear() 
'Force the browser to display instead of bringing up the download dialog. 
Call Response.AddHeader("Content-Disposition", "inline;filename=somepdf.pdf") 
'Write binary from the xhr responses body. 
Call Response.BinaryWrite(httpReq.ResponseBody) 
%> 

理想的情況下，通過XHR （或與此有關的任何URL）你應該檢查httpReq.Status讓你單獨處理任何錯誤返回二進制使用REST API時，即使設置了不同的content-type如果有錯誤。

您可以重構上述示例;

<% 
'Make sure nothing in the Response buffer. 
Call Response.Clear() 
'Check we have a valid status returned from the XHR. 
If httpReq.Status = 200 Then 
    Response.ContentType = "application/pdf" 
    'Force the browser to display instead of bringing up the download dialog. 
    Call Response.AddHeader("Content-Disposition", "inline;filename=somepdf.pdf") 
    'Write binary from the xhr responses body. 
    Call Response.BinaryWrite(httpReq.ResponseBody) 
Else 
    'Set Content-Type to HTML and return a relevant error message. 
    Response.ContentType = "text/html" 
    '... 
End If 
%> 

---

• Content-Disposition:What are the differences between 「inline」 and 「attachment」?

• A: ASP Classic, Download big files does not work on certain servers（上分塊您的下載有用的提示）

Answer 2

你必須定義爲響應的內容類型PDF：

Response.ContentType = "application/pdf" 

則二進制數據寫入響應：

Response.BinaryWrite(httpReq.ResponseBody) 

完整例如：

url = "http://yourURL" 

Set httpReq = Server.CreateObject("MSXML2.ServerXMLHTTP") 
httpReq.Open "GET", url, False 
httpReq.Send 

If httpReq.Status = "200" Then 
    Response.ContentType = "application/pdf" 
    Response.BinaryWrite(httpReq.ResponseBody) 
Else 
    ' Display an error message 
    Response.Write("Error") 
End If