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do any server-side environments currently present an array/array-like structure from request parameters with duplicate names (and specifically without any kind of array indicator, like name[] in php requests for example)?

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Sure, yes. In Python land for example Django and Flask both present the request parameters in a dictionary-like data structure that supports lookup of the complete list of values passed for a given name. Regular lookups will give you just a single value, but they also present an interface to get the complete list.

jersey[0], the reference implementation of JAX-RS[1] does this if you specify an incoming query string parameter as a `List`

[0] https://jersey.java.net/ [1] https://jax-rs-spec.java.net/

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