确认沙箱环境签名key接口Content-Type问题已修复

[Copilot]

getSandboxSignKey() 方法在 v4.7.0 版本中发送 XML 请求时未指定 Content-Type，导致默认使用 application/json，微信服务器无法解析 XML 请求体。

问题分析

v4.7.0 代码:

String responseContent = this.post(url, request.toXML(), false);

当前 develop 分支 (4.7.8.B) 已修复:

String responseContent = this.post(url, request.toXML(), false, ContentType.APPLICATION_XML.getMimeType());

结论

此问题已在 develop 分支修复。使用 v4.7.0 的用户升级到 v4.7.8+ 即可解决。

Fixes #3607

Original prompt

---

This section details on the original issue you should resolve

<issue_title>获取沙箱环境签名key接口报错："mch_id" is required. "sign" is required. "nonce_str" is required</issue_title>
<issue_description>### 获取沙箱环境签名key接口报错
"mch_id" is required. "sign" is required. "nonce_str" is required
明明是有值的
`
<mch_id>3129345678</mch_id>
<nonce_str>1749114345872</nonce_str>
202524F6AF0E4AFA225F96CB34822492

`

版本环境

`
com.github.binarywang
weixin-java-pay
4.7.0

`

大概原因

`httpPost.setEntity(createEntry(requestStr));
private static StringEntity createEntry(String requestStr) {
return new StringEntity(requestStr, ContentType.create("application/json", StandardCharsets.UTF_8));
}

String url = "https://api.mch.weixin.qq.com/xdc/apiv2getsignkey/sign/getsignkey";
String responseContent = this.post(url, request.toXML(), false);
请求接口getsignkey需要xml的格式，而post里面设置header又变成了application/json，这样传递数据就不被识别？

`

报错日志

`2025-06-05 17:05:46.107 INFO 10512 --- [nio-8080-exec-5] c.g.b.w.s.i.WxPayServiceApacheHttpImpl :
【请求地址】：https://api.mch.weixin.qq.com/xdc/apiv2getsignkey/sign/getsignkey
【请求数据】：
<mch_id>3129345678</mch_id>
<nonce_str>1749114345872</nonce_str>
202524F6AF0E4AFA225F96CB34822492

【响应数据】：
<return_code></return_code>
<return_msg></return_msg>

2025-06-05 17:05:46.122 ERROR 10512 --- [nio-8080-exec-5] c.g.b.w.b.r.WxPaySandboxSignKeyResult :
结果业务代码异常，返回结果：{return_msg="mch_id" is required. "sign" is required. "nonce_str" is required, return_code=FAIL},
返回代码：FAIL，返回信息："mch_id" is required. "sign" is required. "nonce_str" is required
2025-06-05 17:05:46.125 ERROR 10512 --- [nio-8080-exec-5] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is WxPayException(customErrorMsg=null, returnCode=FAIL, returnMsg="mch_id" is required. "sign" is required. "nonce_str" is required, resultCode=null, errCode=null, errCodeDes=null, xmlString=
<return_code></return_code>
<return_msg></return_msg>
)] with root cause

com.github.binarywang.wxpay.exception.WxPayException: 返回代码：[FAIL]，返回信息：["mch_id" is required. "sign" is required. "nonce_str" is required]，微信返回的原始报文：

<return_code></return_code>
<return_msg></return_msg>

at com.github.binarywang.wxpay.exception.WxPayException$Builder.build(WxPayException.java:207) ~[weixin-java-pay-4.7.5-20250529.111829.jar:na]
at com.github.binarywang.wxpay.exception.WxPayException.from(WxPayException.java:99) ~[weixin-java-pay-4.7.5-20250529.111829.jar:na]
at com.github.binarywang.wxpay.bean.result.BaseWxPayResult.checkResult(BaseWxPayResult.java:392) ~[weixin-java-pay-4.7.5-20250529.111829.jar:na]
at com.github.binarywang.wxpay.service.impl.BaseWxPayServiceImpl.getSandboxSignKey(BaseWxPayServiceImpl.java:1236) ~[weixin-java-pay-4.7.5-20250529.111829.jar:na]
at com.github.binarywang.demo.wx.pay.controller.WxPayController.getSandboxSignKey(WxPayController.java:363) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-5.3.15.jar:5.3.15]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150) ~[spring-web-5.3.15.jar:5.3.15]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117) ~[spring-webmvc-5.3.15.jar:5.3.15]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) ~[spring-webmvc-5.3.15.jar:5.3.15]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.15.jar:5.3.15]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.15.jar:5.3.15]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1067) ~[spring-webmvc-5.3.15.jar:5.3.15]
at org.springframework.web.servlet...

Custom agent used: 全部用中文
需要用中文，包括PR标题和分析总结过程

• Fixes 获取沙箱环境签名key接口报错："mch_id" is required. "sign" is required. "nonce_str" is required #3607

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