ВОт так?
location / {
if ($query_string ~ param1=a ) {
error_page 418 = @restricted;
}
proxy_pass http://127.0.0.1:8080;
}

location @restricted {
internal;
auth_basic "Restricted";
auth_basic_user_file include/passwd/testpass.txt;
proxy_pass http://127.0.0.1:8080;
}
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