微信支付API v3的Apache HttpClient扩展，实现了请求签名的生成和应答签名的验证。
The enterprise Java community has made great strides to simplify file uploads from a web browser to a server. What was once a task that involved many cross-platform complications is now ...
EXCEPTION:stacktrace :java.lang.IllegalArgumentException: Arguments to addParameter(String, String) cannot be null at org.apache.commons.httpclient.methods.PostMethod.addParameter(PostMethod.java:268) ...
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