[英]iOS: Data from URLSession.shared.dataTask(with: url is always nil (display 0 bytes bug in xcode debugger?)
[英]URLSession.shared.dataTask Data is Always Empty When Hitting Node Express Endpoint
我有一個簡單的Node Express端點,可以使用curl成功擊中它:
curl --header "Content-Type: application/json" \
--request POST \
--data '{"lat":33.485834000000001,"long":-100.106417}' \
http://192.168.99.100:49160/login
{"status":200,"data":{"userId":"bff37d9c-25a9-421b-aa58-eba0fef0da03"},"message":null}
但是,當我嘗試擊中相同的端點但在以下情況下使用Swift 4時:
let task = URLSession.shared.dataTask(with: urlRequest) { data, response, error in
guard let serverData = data, error == nil else {
handler(ResponseBuilder().set(error: ErrorType.network).build())
return
}
// Process data.
}
task.resume()
URLSession返回給我的“數據”中沒有任何內容。 我希望數據包含與上面返回的curl相同的值。
就像我期望的那樣填充了“響應”:
Optional<NSURLResponse>
- some : <NSHTTPURLResponse: 0x600000a1a5a0> { URL: http://192.168.99.100:49160/login } { Status Code: 200, Headers {
Connection = (
"keep-alive"
);
"Content-Length" = (
86
);
"Content-Type" = (
"application/json; charset=utf-8"
);
Date = (
"Thu, 25 Oct 2018 05:51:39 GMT"
);
Etag = (
"W/\"56-8ZCdAcNDopMfakzfNDEniZ0fgoc\""
);
"X-Powered-By" = (
Express
);
} }
“錯誤”為零,我在服務器上看到登錄消息,表明它已被命中,但數據仍然為空。
我正在使用模擬器運行iOS應用。
我在這里錯過明顯的東西嗎?
更新1
要回答以下一些問題。 “ urlRequest”的創建如下:
var urlRequest = URLRequest(url: request.url)
urlRequest.addValue("application/json", forHTTPHeaderField: "Content-Type")
urlRequest.addValue("application/json", forHTTPHeaderField: "Accept")
urlRequest.httpMethod = "POST"
urlRequest.httpBody = try? JSONSerialization.data(withJSONObject: request.data, options: .prettyPrinted)
其中“請求”只是我使用的包裝對象,其內容是:
Request
▿ url : http://192.168.99.100:49160/login
- _url : http://192.168.99.100:49160/login
▿ data : 2 elements
▿ 0 : 2 elements
- key : "lat"
- value : 33.485834000000001
▿ 1 : 2 elements
- key : "long"
- value : -100.106417
更新3
有人建議我安裝了Charles Proxy。 結果如下:
請求:
{
"lat" : 33.485834000000001,
"long" : -100.106417
}
響應:
{"status":200,"data":{"userId":"3d559555-c0ad-4e3a-a10b-3e267ee7f662"},"message":null}
不幸的答案是,在這種情況下,xcode調試器可能不可靠(URLSession上下文中的完成處理程序)-它始終將數據顯示為0字節。
使用以下任一方法打印數據:
let received = String(data: data!, encoding: String.Encoding.utf8)
print("\(received)")
要么
let resultObject = try JSONSerialization.jsonObject(with: data!, options: [.allowFragments,])
print("\(resultObject)")
盡量不要過分搖頭以拉緊脖子...
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.