Unicode character problem

1. If you enter Unicode characters, an error occurs.
   so i have to change unicode characters to url encoded text

The following query results in an error.
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[http://redmine:3000/issues?set_filter=1&f[]=project&op[project]==&v[project][]=ANB&f[]=cf_13&op[cf_13]=*~&v[cf_13][]=]디지털무역물류플랫폼
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However, if you enter Korean characters using URL encoding, it works correctly.
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[http://redmine:3000/issues?set_filter=1&f[]=project&op[project]==&v[project][]=ANB&f[]=cf_13&op[cf_13]=*~&v[cf_13][]=%EB%94%94%EC%A7%80%ED%84%B8%EB%AC%B4%EC%97%AD%EB%AC%BC%EB%A5%98%ED%94%8C%EB%9E%AB%ED%8F%BC]
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2. If you enter '_{' character, it disappears. so i have to url encoding '}' to '%7E'

input ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[http://redmine:3000/issues?set_filter=1&f[]=project&op[project]==&v[project][]=ANB&f[]=cf_13&op[cf_13]=*~&v[cf_13][]=%EB%94%94%EC%A7%80%ED%84%B8%EB%AC%B4%EC%97%AD%EB%AC%BC%EB%A5%98%ED%94%8C%EB%9E%AB%ED%8F%BC]
 
output ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[http://redmine:3000/issues?set_filter=1&f[]=project&op[project]==&v[project][]=ANB&f[]=cf_13&op[cf_13]=*&v[cf_13][]=%EB%94%94%EC%A7%80%ED%84%B8%EB%AC%B4%EC%97%AD%EB%AC%BC%EB%A5%98%ED%94%8C%EB%9E%AB%ED%8F%BC]