Dualstack (IPv6) endpoint doesn't work

[keichan34]

I'm trying to use s5cmd to upload many large files on a IPv6 native connection (IPv4 is available, but because it goes through a proxy, there's a performance penalty)

Here are some details on the error:

$ s5cmd version
v2.2.2-48f7e59

> s5cmd --endpoint-url 'https://s3.dualstack.ap-northeast-1.amazonaws.com' -r 1 -log debug ls s3://bucket-name/path/
DEBUG retryable error: SerializationError: failed to unmarshal error message
	status code: 400, request id:
caused by: UnmarshalError: failed to unmarshal error message
	00000000  3c 3f 78 6d 6c 20 76 65  72 73 69 6f 6e 3d 22 31  |<?xml version="1|
00000010  2e 30 22 20 65 6e 63 6f  64 69 6e 67 3d 22 55 54  |.0" encoding="UT|
00000020  46 2d 38 22 3f 3e 0a 3c  45 72 72 6f 72 3e 3c 43  |F-8"?>.<Error><C|
00000030  6f 64 65 3e 49 6e 76 61  6c 69 64 52 65 71 75 65  |ode>InvalidReque|
00000040  73 74 3c 2f 43 6f 64 65  3e 3c 4d 65 73 73 61 67  |st</Code><Messag|
00000050  65 3e 4d 69 73 73 69 6e  67 20 72 65 71 75 69 72  |e>Missing requir|
00000060  65 64 20 68 65 61 64 65  72 20 66 6f 72 20 74 68  |ed header for th|
00000070  69 73 20 72 65 71 75 65  73 74 3a 20 78 2d 61 6d  |is request: x-am|
00000080  7a 2d 63 6f 6e 74 65 6e  74 2d 73 68 61 32 35 36  |z-content-sha256|
00000090  3c 2f 4d 65 73 73 61 67  65 3e 3c 52 65 71 75 65  |</Message><Reque|
000000a0  73 74 49 64 3e 4e 4d 43  30 42 57 33 35 41 52 30  |stId>NMC0BW35AR0|
000000b0  42 50 39 51 45 3c 2f 52  65 71 75 65 73 74 49 64  |BP9QE</RequestId|
000000c0  3e 3c 48 6f 73 74 49 64  3e 4e 74 70 56 56 39 58  |><HostId>NtpVV9X|
000000d0  5a 6d 63 64 6e 67 5a 5a  53 70 66 38 6f 31 72 76  |ZmcdngZZSpf8o1rv|
000000e0  6e 48 51 50 65 48 6c 39  4d 74 44 63 77 63 6a 41  |nHQPeHl9MtDcwcjA|
000000f0  6a 4b 71 55 36 79 44 56  61 5a 69 68 69 54 7a 53  |jKqU6yDVaZihiTzS|
00000100  52 36 30 32 54 47 4c 4e  33 37 5a 57 77 72 59 61  |R602TGLN37ZWwrYa|
00000110  4a 57 78 59 3d 3c 2f 48  6f 73 74 49 64 3e 3c 2f  |JWxY=</HostId></|
00000120  45 72 72 6f 72 3e                                 |Error>|

caused by: unknown error response tag, {{ Error} []}
DEBUG retryable error: SerializationError: failed to unmarshal error message
	status code: 400, request id:
caused by: UnmarshalError: failed to unmarshal error message
...

Looking at the error, I see a related issue: #542
I tried to look at the source code to see if there were any obvious places where the handling would be different, but I wasn't able to find anything obvious.

Anyone know if there's an easy way to enable dualstack for s5cmd?