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browse/origin-search: Percent encode ? character only in origin URL

Description

browse/origin-search: Percent encode ? character only in origin URL

When an origin URL is provided as URL argument to a Web API call performed
by XHR, only percent encode the '?' character as using encodeURIComponent
results in a 404 error in production and staging otherwise (maybe a side
effect of Varnish cache).

Related to T4675