我发现的解决方案是使用MessagePlugin在发送前实质上手动修复XML。我希望有一些更优雅的东西，但这至少可以起作用：
class SoapFixer(MessagePlugin):
def marshalled(self, context):
# Alter the envelope so that the xsd namespace is allowed
context.envelope.nsprefixes['xsd'] = 'http://www.w3.org/2001/XMLSchema'
# Go through every node in the document and apply the fix function to patch up incompatible XML.
context.envelope.walk(self.fix_any_type_string)
def fix_any_type_string(self, element):
"""Used as a filter function with walk in order to fix errors.
If the element has a certain name, give it a xsi:type=xsd:string. Note that the nsprefix xsd must also
be added in to make this work."""
# Fix elements which have these names
fix_names = ['elementnametofix', 'anotherelementname']
if element.name in fix_names:
element.attributes.append(Attribute('xsi:type', 'xsd:string'))
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