THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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The proxyAddress parameter will be in the familiar URL format[1][2], specifically the authority part of a URL without any userinfo part.
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What are minor adjustments that had to be made to the proposal since it was approved?
References
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[2] RFC 3986 sections 3.2.2 and 3.2.3 describing host and port syntax in URLs https://tools.ietf.org/html/rfc3986#section-3.2.2