Invalid xml received when creating a bucket

Describe the bug Our test suite started failing yesterday. We use ansible to create a bucket in minio and it looks like minio is returning some invalid xml (see below). I believe this commit is somehow responsible:

https://github.com/minio/minio/commit/bd032d13ffe014b0a6f072ce87693a0df9037b86

Steps to reproduce Create a bucket in minio using ansible (might also be reproducible using just botocore):

- name: "Create Bucket"
    s3_bucket:
        s3_url: "http://minio:9000"
        region: eu-central-1
        name: test
        state: present

Expected behavior No invalid xml.

Debug logs Here is the output from ansible:

    Traceback (most recent call last):
      File "/home/travis/virtualenv/python3.7.6/lib/python3.7/site-packages/botocore/parsers.py", line 452, in _parse_xml_string_to_dom
        parser.feed(xml_string)
    xml.etree.ElementTree.ParseError: not well-formed (invalid token): line 1, column 38
  
    During handling of the above exception, another exception occurred:
  
    Traceback (most recent call last):
      File "/home/travis/.ansible/tmp/ansible-tmp-1590767894.6118252-82050180509011/AnsiballZ_s3_bucket.py", line 102, in <module>
        _ansiballz_main()
      File "/home/travis/.ansible/tmp/ansible-tmp-1590767894.6118252-82050180509011/AnsiballZ_s3_bucket.py", line 94, in _ansiballz_main
        invoke_module(zipped_mod, temp_path, ANSIBALLZ_PARAMS)
      File "/home/travis/.ansible/tmp/ansible-tmp-1590767894.6118252-82050180509011/AnsiballZ_s3_bucket.py", line 40, in invoke_module
        runpy.run_module(mod_name='ansible.modules.cloud.amazon.s3_bucket', init_globals=None, run_name='__main__', alter_sys=True)
      File "/opt/python/3.7.6/lib/python3.7/runpy.py", line 205, in run_module
        return _run_module_code(code, init_globals, run_name, mod_spec)
      File "/opt/python/3.7.6/lib/python3.7/runpy.py", line 96, in _run_module_code
        mod_name, mod_spec, pkg_name, script_name)
      File "/opt/python/3.7.6/lib/python3.7/runpy.py", line 85, in _run_code
        exec(code, run_globals)
      File "/tmp/ansible_s3_bucket_payload_7bei9nfw/ansible_s3_bucket_payload.zip/ansible/modules/cloud/amazon/s3_bucket.py", line 713, in <module>
      File "/tmp/ansible_s3_bucket_payload_7bei9nfw/ansible_s3_bucket_payload.zip/ansible/modules/cloud/amazon/s3_bucket.py", line 707, in main
      File "/tmp/ansible_s3_bucket_payload_7bei9nfw/ansible_s3_bucket_payload.zip/ansible/modules/cloud/amazon/s3_bucket.py", line 218, in create_or_update_bucket
      File "/tmp/ansible_s3_bucket_payload_7bei9nfw/ansible_s3_bucket_payload.zip/ansible/module_utils/cloud.py", line 153, in retry_func
      File "/tmp/ansible_s3_bucket_payload_7bei9nfw/ansible_s3_bucket_payload.zip/ansible/module_utils/cloud.py", line 140, in retry_func
      File "/tmp/ansible_s3_bucket_payload_7bei9nfw/ansible_s3_bucket_payload.zip/ansible/modules/cloud/amazon/s3_bucket.py", line 405, in get_bucket_request_payment
      File "/home/travis/virtualenv/python3.7.6/lib/python3.7/site-packages/botocore/client.py", line 316, in _api_call
        return self._make_api_call(operation_name, kwargs)
      File "/home/travis/virtualenv/python3.7.6/lib/python3.7/site-packages/botocore/client.py", line 622, in _make_api_call
        operation_model, request_dict, request_context)
      File "/home/travis/virtualenv/python3.7.6/lib/python3.7/site-packages/botocore/client.py", line 641, in _make_request
        return self._endpoint.make_request(operation_model, request_dict)
      File "/home/travis/virtualenv/python3.7.6/lib/python3.7/site-packages/botocore/endpoint.py", line 102, in make_request
        return self._send_request(request_dict, operation_model)
      File "/home/travis/virtualenv/python3.7.6/lib/python3.7/site-packages/botocore/endpoint.py", line 135, in _send_request
        request, operation_model, context)
      File "/home/travis/virtualenv/python3.7.6/lib/python3.7/site-packages/botocore/endpoint.py", line 167, in _get_response
        request, operation_model)
      File "/home/travis/virtualenv/python3.7.6/lib/python3.7/site-packages/botocore/endpoint.py", line 218, in _do_get_response
        response_dict, operation_model.output_shape)
      File "/home/travis/virtualenv/python3.7.6/lib/python3.7/site-packages/botocore/parsers.py", line 246, in parse
        parsed = self._do_parse(response, shape)
      File "/home/travis/virtualenv/python3.7.6/lib/python3.7/site-packages/botocore/parsers.py", line 810, in _do_parse
        self._add_modeled_parse(response, shape, final_parsed)
      File "/home/travis/virtualenv/python3.7.6/lib/python3.7/site-packages/botocore/parsers.py", line 819, in _add_modeled_parse
        self._parse_payload(response, shape, member_shapes, final_parsed)
      File "/home/travis/virtualenv/python3.7.6/lib/python3.7/site-packages/botocore/parsers.py", line 859, in _parse_payload
        original_parsed = self._initial_body_parse(response['body'])
      File "/home/travis/virtualenv/python3.7.6/lib/python3.7/site-packages/botocore/parsers.py", line 945, in _initial_body_parse
        return self._parse_xml_string_to_dom(xml_string)
      File "/home/travis/virtualenv/python3.7.6/lib/python3.7/site-packages/botocore/parsers.py", line 458, in _parse_xml_string_to_dom
        (e, xml_string))
    botocore.parsers.ResponseParserError: Unable to parse response (not well-formed (invalid token): line 1, column 38), invalid XML received. Further retries may succeed:
    b'<?xml version="1.0" encoding="UTF-8"?>\\n<RequestPaymentConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/"><Payer>BucketOwner</Payer></RequestPaymentConfiguration>'

[nateprewitt]

Ah, missed the minio piece. Thanks @daviddavis 😃

[daviddavis]

Here is the minio issue: https://github.com/minio/minio/issues/9736