You can use the custom-query-parameters-parser policy to set variables such as request attributes and other execution context attributes.
You can use it to change the way query parameters are extracted.
Semicolon character (;) is not considered as a separator:
http://host:port/my-api?filter=field1;field2 will be computed with this query param: filter: ['field1;field']
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Warning
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Policies are executed after flow evaluation: for a condition on a flow using Expression Language to test query parameters, they will be extracted the regular way by the Gateway, with ; as a separator.
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