请教一个 url 访问的问题

[Musong]

情况: 目前有一个文件下载路径 https://xxx.xx/file.json
在 4G 环境下可以下载，在 wifi 下无法访问
但是相同目录下 https://xxx.xx/file2.json 两种网络均正常访问

请问下有没有类似 nslookup 之类的命令或其他工具，可以查一下 https://xxx.xx/file.json 在 wifi 下无法访问的原因。
感谢各位

[leonshaw]

文件多大？

[Musong]

@leonshaw #1 一个 400 多字节的 json

[fisherwei]

curl -v https://xxx.xx/file.json 看看

[collinmehle]

@fisherwei OP 意思是手机上？

[fisherwei]

@collinmehle 没注意是说手机

手机的话，ios 上有一个 HE.net 出的 app ，叫 Network Tools 。
https://apps.apple.com/us/app/he-net-network-tools/id858241710

[leonshaw]

@Musong 两个一样大？有点怀疑 mtu

[Musong]

@fisherwei #3 试了一下，https://xxx.xx/file.json ，指向的 ip 每次指向不同，但 4G 都能访问
wifi 在连接 ip 时会超时，十几次只有 1 次成功

[Musong]

* Trying [cdn ip] :443...
* Connected to xxx.xx( [cdn ip] ) port 443 (#0)
* schannel: disabled automatic use of client certificate
* ALPN: offers http/1.1
* ALPN: server accepted http/1.1
> GET file.json HTTP/1.1
> Host: xxx.xx
> User-Agent: curl/7.83.1
> Accept: */*
>
* Mark bundle as not supporting multiuse
< HTTP/1.1 200 OK
< Server: Tengine
< Content-Type: application/json
< Content-Length: 463
< Connection: keep-alive
< Date: Mon, 03 Apr 2023 06:07:18 GMT
< x-oss-request-id: 642A6D1628517835305023A5
< x-oss-cdn-auth: success
< Accept-Ranges: bytes
< ETag: "A8659892362ACE6F19A6B8DC5D4A51A7"
< Last-Modified: Thu, 30 Mar 2023 11:05:03 GMT
< x-oss-object-type: Normal
< x-oss-hash-crc64ecma: 2907436546213679395
< x-oss-storage-class: Standard
< Content-MD5: qGWYkjYqzm8ZprjcXUpRpw==
< x-oss-server-time: 49
< Ali-Swift-Global-Savetime: 1680502038
< Via: cache46.l2nu20-1[298,297,200-0,M], cache41.l2nu20-1[300,0], vcache4.cn3147[0,0,200-0,H], vcache15.cn3147[2,0]
< Age: 1478
< X-Cache: HIT TCP_MEM_HIT dirn:11:108262168
< X-Swift-SaveTime: Mon, 03 Apr 2023 06:07:18 GMT
< X-Swift-CacheTime: 3600
< Timing-Allow-Origin: *
< EagleId: ddc2a12316805035162551519e
<
[{"key":"test","version":1035,"supports":[1001,1002,1003,1004,1005,1006,1007,1008,1009,1010,1011,1012,1013,1014,1015,1016,1017,1018,1019,1020,1021,1022,1023,1024,1025,1026,1027,1028,1029,1030,1031,1032,1033,1034]},{"key":"fish","version":1035,"supports":[1005,1006,1007,1008,1009,1010,1011,1012,1013,1014,1015,1016,1017,1018,1019,1020,1021,1022,1023,1024,1025,1026,1027,1028,1029,1030,1031,1032,1033,1034]}]* Connection #0 to xxx.xx left intact