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URL常量中添加?charset=utf-8会导致生成的URL中出现https://openapi.alipay.com/gateway.do?charset=utf-8?app_id=xxx的错误,导致访问失败。
例如生成的URL:https://openapi.alipay.com/gateway.do?charset=utf-8?app_id=2019071165855011&format=JSON&charset=utf-8&sign_type=RSA2&version=1.0¬ify_url=http%3A%2F%2Fdev.quncloud.net%2Fcallback%2Fweb×tamp=2019-07-20+11%3A48%3A52&biz_content=%7B%22total_amount%22%3A%221000%22%2C%22subject%22%3A%22%5Cu5e7f%5Cu544a%5Cu4e3b%5Cu5145%5Cu503c1000%5Cu5143%22%2C%22out_trade_no%22%3A626549201102176256%2C%22product_code%22%3A%22FAST_INSTANT_TRADE_PAY%22%7D&method=alipay.trade.page.pay&sign=kCjxN1gYkWlVhr089JdL%2Bjy5odc6Onq3efRjbfbPhDVMQsv8yv1h42fzt%2BN6ZyfzIOfJgdZ81FXxoSysmekvXtfIb2UgLKE%2BOGvui5U3fzaIIh%2FbX5Fh1gnCd2z6Ne8sGS4jE9KI111%2F8QH%2BCKdhircmwf6QfJPU4dw4o5qVxOKuyxjRCbAePZyR05rRnBEOhLUf5e5s6xPI9R%2FafZdaxmdYQVh7DZoyq%2BiZMuiNvmrwwbybtlkC6msjVdNSNxJlitlCI%2BxiijRLS0WSqDUDeoF2qCzPwnl7FRl42a%2Fz4Eu7sC1DqIDfrbZNiKPPeqDV56yhEESW6jQPasDCyEdYvw%3D%3D