如上一步生成的签名串为0EEm/HtGRr/VJXTAD9tYMth1Bzm3lLHz5RCDv1GdM8s=,则其编码后为0EEm%2FHtGRr%2FVJXTAD9tYMth1Bzm3lLHz5RCDv1GdM8s%3D
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