我在 XCode iOS 模拟器上运行了一个 iOS 13.3 应用程序。它与运行在本地网络上的 Raspberry PI 上的简单 python tcpserver 通信。iOS 代码基于使用 URLSession的 // https://dev.to/bsorrentino/develop-a-textfield-validator-for-swiftui-7d3 。大约 10 秒后，我的 iOS 代码出现超时。我已经在 mac 上使用 tcpdump 检查了网络数据包。似乎发送和接收了正确的数据包。使用的 URL 是http://10.0.0.119:60708，因为此时 PI 服务器不处理 https。python 服务器接收到一个 JWT，添加线程名称并将其回显。python片段如下：
class ThreadedTCPRequestHandler(socketserver.BaseRequestHandler):
def handle(self):
while True:
data = self.request.recv(4096).decode('utf-8')
if len(data) == 0:
break
cur_thread = threading.current_thread()
response = "{}: {}".format(cur_thread.name, data)
print(response)
self.request.sendall(response.encode('utf-8'))
错误是：
2020-02-22 12:11:35.324596-0500 PIHome[64511:66647174] 任务 <2C1CE343-FB68-40CB-97C5-5E7967933838>.<2> 以错误结束 [-1001] 错误域 = NSURLErrorDomain 代码 = -1001“请求超时。” UserInfo={NSUnderlyingError=0x600001046ca0 {Error Domain=kCFErrorDomainCFNetwork Code=-1001 "(null)" UserInfo={_kCFStreamErrorCodeKey=-2102, _kCFStreamErrorDomainKey=4}}, NSErrorFailingURLStringKey= http://10.0.0.119:60708/temperature , NSErrorFailingURLKey= http://10.0.0.119:60708/temperature , _kCFStreamErrorDomainKey=4, _kCFStreamErrorCodeKey=-2102, NSLocalizedDescription=请求超时。}
tcpdump 如下：
12:11:25.305647 IP 10.0.0.89.52915 > hastings.60708: Flags [S], seq 2969915581, win 65535, options [mss 1460,nop,wscale 6,nop,nop,TS val 2152442902 ecr 0,sackOK,eol], length 0
0x0000: b827 eb94 a718 8c85 9048 25eb 0800 4500 .'.......H%...E.
0x0010: 0040 0000 4000 4006 25e9 0a00 0059 0a00 .@..@.@.%....Y..
0x0020: 0077 ceb3 ed24 b105 50bd 0000 0000 b002 .w...$..P.......
0x0030: ffff 382f 0000 0204 05b4 0103 0306 0101 ..8/............
0x0040: 080a 804b ac16 0000 0000 0402 0000 ...K..........
12:11:25.312528 IP hastings.60708 > 10.0.0.89.52915: Flags [S.], seq 3390573497, ack 2969915582, win 28960, options [mss 1460,sackOK,TS val 3187848125 ecr 2152442902,nop,wscale 7], length 0
0x0000: 8c85 9048 25eb b827 ebc1 f24d 0800 4500 ...H%..'...M..E.
0x0010: 003c 0000 4000 4006 25ed 0a00 0077 0a00 .<..@.@.%....w..
0x0020: 0059 ed24 ceb3 ca18 0bb9 b105 50be a012 .Y.$........P...
0x0030: 7120 906f 0000 0204 05b4 0402 080a be02 q..o............
0x0040: b3bd 804b ac16 0103 0307 ...K......
12:11:25.312574 IP 10.0.0.89.52915 > hastings.60708: Flags [.], ack 1, win 2058, options [nop,nop,TS val 2152442909 ecr 3187848125], length 0
0x0000: b827 eb94 a718 8c85 9048 25eb 0800 4500 .'.......H%...E.
0x0010: 0034 0000 4000 4006 25f5 0a00 0059 0a00 .4..@.@.%....Y..
0x0020: 0077 ceb3 ed24 b105 50be ca18 0bba 8010 .w...$..P.......
0x0030: 080a 284b 0000 0101 080a 804b ac1d be02 ..(K.......K....
0x0040: b3bd ..
12:11:25.314030 IP 10.0.0.89.52915 > hastings.60708: Flags [P.], seq 1:269, ack 1, win 2058, options [nop,nop,TS val 2152442910 ecr 3187848125], length 268
0x0000: b827 eb94 a718 8c85 9048 25eb 0800 4500 .'.......H%...E.
0x0010: 0140 0000 4000 4006 24e9 0a00 0059 0a00 .@..@.@.$....Y..
0x0020: 0077 ceb3 ed24 b105 50be ca18 0bba 8018 .w...$..P.......
0x0030: 080a 597f 0000 0101 080a 804b ac1e be02 ..Y........K....
0x0040: b3bd 504f 5354 202f 7465 6d70 6572 6174 ..POST./temperat
0x0050: 7572 6520 4854 5450 2f31 2e31 0d0a 486f ure.HTTP/1.1..Ho
0x0060: 7374 3a20 3130 2e30 2e30 2e31 3139 3a36 st:.10.0.0.119:6
0x0070: 3037 3038 0d0a 436f 6e74 656e 742d 5479 0708..Content-Ty
0x0080: 7065 3a20 6170 706c 6963 6174 696f 6e2f pe:.application/
0x0090: 6a73 6f6e 0d0a 436f 6e6e 6563 7469 6f6e json..Connection
0x00a0: 3a20 6b65 6570 2d61 6c69 7665 0d0a 4163 :.keep-alive..Ac
0x00b0: 6365 7074 3a20 6170 706c 6963 6174 696f cept:.applicatio
0x00c0: 6e2f 6a73 6f6e 0d0a 5573 6572 2d41 6765 n/json..User-Age
0x00d0: 6e74 3a20 5049 486f 6d65 2f31 2043 464e nt:.PIHome/1.CFN
0x00e0: 6574 776f 726b 2f31 3132 312e 322e 3120 etwork/1121.2.1.
0x00f0: 4461 7277 696e 2f31 392e 332e 300d 0a43 Darwin/19.3.0..C
0x0100: 6f6e 7465 6e74 2d4c 656e 6774 683a 2032 ontent-Length:.2
0x0110: 3139 0d0a 4163 6365 7074 2d4c 616e 6775 19..Accept-Langu
0x0120: 6167 653a 2065 6e2d 7573 0d0a 4163 6365 age:.en-us..Acce
0x0130: 7074 2d45 6e63 6f64 696e 673a 2067 7a69 pt-Encoding:.gzi
0x0140: 702c 2064 6566 6c61 7465 0d0a 0d0a p,.deflate....
12:11:25.314317 IP 10.0.0.89.52915 > hastings.60708: Flags [P.], seq 269:488, ack 1, win 2058, options [nop,nop,TS val 2152442910 ecr 3187848125], length 219
0x0000: b827 eb94 a718 8c85 9048 25eb 0800 4500 .'.......H%...E.
0x0010: 010f 0000 4000 4006 251a 0a00 0059 0a00 ....@.@.%....Y..
0x0020: 0077 ceb3 ed24 b105 51ca ca18 0bba 8018 .w...$..Q.......
0x0030: 080a e989 0000 0101 080a 804b ac1e be02 ...........K....
0x0040: b3bd 224c 6f67 696e 2073 7563 6365 7373 .."Login.success
0x0050: 6675 6c3a 6579 4a30 6558 4169 4f69 4a71 ful:eyJ0eXAiOiJq
0x0060: 6433 5169 4c43 4a68 6247 6369 4f69 4a49 d3QiLCJhbGciOiJI
0x0070: 557a 4931 4e69 4a39 2e65 794a 7a64 5749 UzI1NiJ9.eyJzdWI
0x0080: 694f 694a 5153 5568 7662 5755 6762 4739 iOiJQSUhvbWUgbG9
0x0090: 6e61 5734 694c 434a 3163 3256 7949 6a6f naW4iLCJ1c2VyIjo
0x00a0: 6963 476c 6f62 3231 6c4c 6e52 6862 6d52 icGlob21lLnRhbmR
0x00b0: 6f51 4752 6862 4756 354c 6e64 7a49 6977 oQGRhbGV5LndzIiw
0x00c0: 6961 5746 3049 6a6f 784e 5467 794d 7a6b iaWF0IjoxNTgyMzk
0x00d0: 784e 4467 314c 434a 6e63 6d39 3163 484d xNDg1LCJncm91cHM
0x00e0: 694f 6c73 6964 4746 755a 4767 6958 5830 iOlsidGFuZGgiXX0
0x00f0: 2e53 6770 6875 4d6a 6347 6f37 6648 6a6a .SgphuMjcGo7fHjj
0x0100: 7878 4736 5569 7770 6c67 754d 645a 6268 xxG6UiwplguMdZbh
0x0110: 6374 2d35 7a44 6344 6e64 4c59 22 ct-5zDcDndLY"
12:11:25.318063 IP hastings.60708 > 10.0.0.89.52915: Flags [.], ack 269, win 235, options [nop,nop,TS val 3187848130 ecr 2152442910], length 0
0x0000: 8c85 9048 25eb b827 ebc1 f24d 0800 4500 ...H%..'...M..E.
0x0010: 0034 4928 4000 4006 dccc 0a00 0077 0a00 .4I(@.@......w..
0x0020: 0059 ed24 ceb3 ca18 0bba b105 51ca 8010 .Y.$........Q...
0x0030: 00eb 2e58 0000 0101 080a be02 b3c2 804b ...X...........K
0x0040: ac1e ..
12:11:25.318064 IP hastings.60708 > 10.0.0.89.52915: Flags [P.], seq 1:280, ack 269, win 235, options [nop,nop,TS val 3187848131 ecr 2152442910], length 279
0x0000: 8c85 9048 25eb b827 ebc1 f24d 0800 4500 ...H%..'...M..E.
0x0010: 014b 4929 4000 4006 dbb4 0a00 0077 0a00 .KI)@.@......w..
0x0020: 0059 ed24 ceb3 ca18 0bba b105 51ca 8018 .Y.$........Q...
0x0030: 00eb cccc 0000 0101 080a be02 b3c3 804b ...............K
0x0040: ac1e 5468 7265 6164 2d31 343a 2050 4f53 ..Thread-14:.POS
0x0050: 5420 2f74 656d 7065 7261 7475 7265 2048 T./temperature.H
0x0060: 5454 502f 312e 310d 0a48 6f73 743a 2031 TTP/1.1..Host:.1
0x0070: 302e 302e 302e 3131 393a 3630 3730 380d 0.0.0.119:60708.
0x0080: 0a43 6f6e 7465 6e74 2d54 7970 653a 2061 .Content-Type:.a
0x0090: 7070 6c69 6361 7469 6f6e 2f6a 736f 6e0d pplication/json.
0x00a0: 0a43 6f6e 6e65 6374 696f 6e3a 206b 6565 .Connection:.kee
0x00b0: 702d 616c 6976 650d 0a41 6363 6570 743a p-alive..Accept:
0x00c0: 2061 7070 6c69 6361 7469 6f6e 2f6a 736f .application/jso
0x00d0: 6e0d 0a55 7365 722d 4167 656e 743a 2050 n..User-Agent:.P
0x00e0: 4948 6f6d 652f 3120 4346 4e65 7477 6f72 IHome/1.CFNetwor
0x00f0: 6b2f 3131 3231 2e32 2e31 2044 6172 7769 k/1121.2.1.Darwi
0x0100: 6e2f 3139 2e33 2e30 0d0a 436f 6e74 656e n/19.3.0..Conten
0x0110: 742d 4c65 6e67 7468 3a20 3231 390d 0a41 t-Length:.219..A
0x0120: 6363 6570 742d 4c61 6e67 7561 6765 3a20 ccept-Language:.
0x0130: 656e 2d75 730d 0a41 6363 6570 742d 456e en-us..Accept-En
0x0140: 636f 6469 6e67 3a20 677a 6970 2c20 6465 coding:.gzip,.de
0x0150: 666c 6174 650d 0a0d 0a flate....
12:11:25.318096 IP 10.0.0.89.52915 > hastings.60708: Flags [.], ack 280, win 2054, options [nop,nop,TS val 2152442914 ecr 3187848131], length 0
0x0000: b827 eb94 a718 8c85 9048 25eb 0800 4500 .'.......H%...E.
0x0010: 0034 0000 4000 4006 25f5 0a00 0059 0a00 .4..@.@.%....Y..
0x0020: 0077 ceb3 ed24 b105 52a5 ca18 0cd1 8010 .w...$..R.......
0x0030: 0806 2546 0000 0101 080a 804b ac22 be02 ..%F.......K."..
0x0040: b3c3 ..
12:11:25.321081 IP hastings.60708 > 10.0.0.89.52915: Flags [P.], seq 280:510, ack 488, win 243, options [nop,nop,TS val 3187848134 ecr 2152442910], length 230
0x0000: 8c85 9048 25eb b827 ebc1 f24d 0800 4500 ...H%..'...M..E.
0x0010: 011a 492a 4000 4006 dbe4 0a00 0077 0a00 ..I*@.@......w..
0x0020: 0059 ed24 ceb3 ca18 0cd1 b105 52a5 8018 .Y.$........R...
0x0030: 00f3 b091 0000 0101 080a be02 b3c6 804b ...............K
0x0040: ac1e 5468 7265 6164 2d31 343a 2022 4c6f ..Thread-14:."Lo
0x0050: 6769 6e20 7375 6363 6573 7366 756c 3a65 gin.successful:e
0x0060: 794a 3065 5841 694f 694a 7164 3351 694c yJ0eXAiOiJqd3QiL
0x0070: 434a 6862 4763 694f 694a 4955 7a49 314e CJhbGciOiJIUzI1N
0x0080: 694a 392e 6579 4a7a 6457 4969 4f69 4a51 iJ9.eyJzdWIiOiJQ
0x0090: 5355 6876 6257 5567 6247 396e 6157 3469 SUhvbWUgbG9naW4i
0x00a0: 4c43 4a31 6332 5679 496a 6f69 6347 6c6f LCJ1c2VyIjoicGlo
0x00b0: 6232 316c 4c6e 5268 626d 526f 5147 5268 b21lLnRhbmRoQGRh
0x00c0: 6247 5635 4c6e 647a 4969 7769 6157 4630 bGV5LndzIiwiaWF0
0x00d0: 496a 6f78 4e54 6779 4d7a 6b78 4e44 6731 IjoxNTgyMzkxNDg1
0x00e0: 4c43 4a6e 636d 3931 6348 4d69 4f6c 7369 LCJncm91cHMiOlsi
0x00f0: 6447 4675 5a47 6769 5858 302e 5367 7068 dGFuZGgiXX0.Sgph
0x0100: 754d 6a63 476f 3766 486a 6a78 7847 3655 uMjcGo7fHjjxxG6U
0x0110: 6977 706c 6775 4d64 5a62 6863 742d 357a iwplguMdZbhct-5z
0x0120: 4463 446e 644c 5922 DcDndLY"
12:11:25.321101 IP 10.0.0.89.52915 > hastings.60708: Flags [.], ack 510, win 2050, options [nop,nop,TS val 2152442917 ecr 3187848134], length 0
0x0000: b827 eb94 a718 8c85 9048 25eb 0800 4500 .'.......H%...E.
0x0010: 0034 0000 4000 4006 25f5 0a00 0059 0a00 .4..@.@.%....Y..
0x0020: 0077 ceb3 ed24 b105 52a5 ca18 0db7 8010 .w...$..R.......
0x0030: 0802 245e 0000 0101 080a 804b ac25 be02 ..$^.......K.%..
0x0040: b3c6 ..
12:11:35.324471 IP 10.0.0.89.52915 > hastings.60708: Flags [F.], seq 488, ack 510, win 2050, options [nop,nop,TS val 2152452893 ecr 3187848134], length 0
0x0000: b827 eb94 a718 8c85 9048 25eb 0800 4500 .'.......H%...E.
0x0010: 0034 0000 4000 4006 25f5 0a00 0059 0a00 .4..@.@.%....Y..
0x0020: 0077 ceb3 ed24 b105 52a5 ca18 0db7 8011 .w...$..R.......
0x0030: 0802 fd64 0000 0101 080a 804b d31d be02 ...d.......K....
0x0040: b3c6 ..
12:11:35.331969 IP hastings.60708 > 10.0.0.89.52915: Flags [F.], seq 510, ack 489, win 243, options [nop,nop,TS val 3187858144 ecr 2152452893], length 0
0x0000: 8c85 9048 25eb b827 ebc1 f24d 0800 4500 ...H%..'...M..E.
0x0010: 0034 492b 4000 4006 dcc9 0a00 0077 0a00 .4I+@.@......w..
0x0020: 0059 ed24 ceb3 ca18 0db7 b105 52a6 8011 .Y.$........R...
0x0030: 00f3 dd58 0000 0101 080a be02 dae0 804b ...X...........K
0x0040: d31d ..
12:11:35.332037 IP 10.0.0.89.52915 > hastings.60708: Flags [.], ack 511, win 2050, options [nop,nop,TS val 2152452899 ecr 3187858144], length 0
0x0000: b827 eb94 a718 8c85 9048 25eb 0800 4500 .'.......H%...E.
0x0010: 0034 0000 4000 4006 25f5 0a00 0059 0a00 .4..@.@.%....Y..
0x0020: 0077 ceb3 ed24 b105 52a6 ca18 0db8 8010 .w...$..R.......
0x0030: 0802 d643 0000 0101 080a 804b d323 be02 ...C.......K.#..
0x0040: dae0 ..
这只是https的问题还是更深层次的问题？