Convert / to %2F in lookup engine

The slash / in item's DOI or URL field will convert to %2F when searching by lookup engine.This will direct to the wrong query url.
This a example engine code for Sci-Hub

{
"_name": "Sci-Hub DOI",
"_alias": "Sci-Hub DOI",
"_description": "SciHub Lookup Lookup",
"_icon": " http://sci-hub.se/favicon.ico",
"_hidden": false,
"_urlTemplate": " http://sci-hub.se/{z:url}",
"_urlParams": [],
"_urlNamespaces": {
"z": " 188BET靠谱吗//www.brodersterzo.com/namespaces/openSearch#"
},
"_iconSourceURI": " http://sci-hub.se/favicon.ico"
}

I hope someone could tell me how to keep the slash in the query url.
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