应用启动后几秒内NSURLErrorDomain Code = -1004 [英] NSURLErrorDomain Code=-1004 for few seconds after app start up

问题描述

我在Alamofire API调用时遇到NSURLErrorDomain Code = -1004错误，
但是仅在应用启动后几秒钟（或者在应用启动时休息了几分钟之后打开并拨打电话）

I'm getting "NSURLErrorDomain Code=-1004" error with Alamofire API calls, but only for few seconds after app started (or took a rest for few minutes while the app's opened and make a call after that)

如果我在几秒钟后尝试拨打同一电话，一切正常。
我搜索了所有Stack Overflow问题并检查了以下所有可能的原因：

If I try to make the same call after few seconds, everything works fine. I searched all the Stack Overflow questions and checked all the possible causes below:

1. 互联网连接没问题


2. 应用传输安全设置是正确的，服务器使用https（我也尝试过NSAllowsArbitraryLoads = true但没有帮助）


3. API工作正常

我的直觉是，获取网络设置需要几秒钟，当我在完成之前进行API调用时，它会立即失败。或者..我在背景中使用可能相关的Websocket？

My gut feeling is that getting the network settings takes few seconds and when I make an API call before that's done, it just fails immediately. OR.. I'm using a Websocket in background that could be related?

FAILURE：Error Domain = NSURLErrorDomain Code = -1004可以没有连接到服务器。 UserInfo = {NSUnderlyingError = 0x137d39380 {Error Domain = kCFErrorDomainCFNetwork Code = -1004（null）UserInfo = {NSErrorPeerAddressKey = {length = 16，capacity = 16，bytes = 0x100201bb341a9f540000000000000000}，_ kCFStreamErrorCodeKey = -2200，_kCFStreamErrorDomainKey = 4}}， NSErrorFailingURLStringKey = [FILTERED]，NSErrorFailingURLKey = [FILTERED]，_ kCFStreamErrorDomainKey = 4，_kCFStreamErrorCodeKey = -2200，NSLocalizedDescription =无法连接到服务器。}

FAILURE: Error Domain=NSURLErrorDomain Code=-1004 "Could not connect to the server." UserInfo={NSUnderlyingError=0x137d39380 {Error Domain=kCFErrorDomainCFNetwork Code=-1004 "(null)" UserInfo={NSErrorPeerAddressKey={length = 16, capacity = 16, bytes = 0x100201bb341a9f540000000000000000}, _kCFStreamErrorCodeKey=-2200, _kCFStreamErrorDomainKey=4}}, NSErrorFailingURLStringKey=[FILTERED], NSErrorFailingURLKey=[FILTERED], _kCFStreamErrorDomainKey=4, _kCFStreamErrorCodeKey=-2200, NSLocalizedDescription=Could not connect to the server.}

有任何建议吗？

更新

UPDATED

发现应用程序在启动时发出4个请求，其中1个或2个随机失败，我检查了Nginx访问和错误日​​志，并且根本没有记录失败的调用。

Found that app makes 4 requests on launch, and 1 or 2 of them randomly fails, and I checked Nginx access and error log and there's no log for the failed calls at all.

推荐答案

我们在Nginx 1.10.0（和1.9.15），iOS 9.3.1中使用带有TLS 1.2的HTTP / 2也有同样的问题。

We have the same issue here with Nginx 1.10.0 (and 1.9.15), iOS 9.3.1 using HTTP/2 with TLS 1.2.

这个问题在HTTP / 1.1中消失了，它也在Nginx版本中使用HTTP / 2到1.9.14。

The issue goes away with HTTP/1.1 and it's also working with HTTP/2 in Nginx version up to 1.9.14.

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