即使设置了Content-Length，Alamofire进度也会返回-1 [英] Alamofire progress returns -1 even though Content-Length is set

问题描述

当我从Alamofire progress调用中打印出预期的字节数时，它始终会打印-1直到最后一刻为止(在打印总字节数时).但是，如果我对Web服务器运行curl命令，则会得到标头输出，其中很清楚地列出了Content-Length标头.

When I print out the expected bytes from an Alamofire progress call it always prints -1 until the very end, when it prints the total. However, if I run a curl command against the webserver I get header output which very clearly lists the Content-Length header.

为什么总是说-1?

推荐答案

尝试一下，

在标头中传递接受编码键.

Pass Accept-Encoding key in header.

对我有用.

let headers = ["Accept-Encoding" : ""]

Alamofire.download(.POST, urlString, headers: headers, destination: destination)   
       .progress { bytesRead, totalBytesRead, totalBytesExpectedToRead in
            print("totalBytesRead: \(totalBytesRead)")
            print("totalBytesExpectedToRead: \(totalBytesExpectedToRead)\n\n")
        }
        .response { request, response, data, error in
        }

原始答案

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