汇联易接口.NET调用存在的坑

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问题

汇联易接口POSTMAN可以调通，C# HttpClient报错500.

{"timestamp":"2023-12-21T05:49:46.362+0000","path":"/gateway/oauth/token","status":500,"error":"Internal Server Error","message":"","requestId":"649c231a"}

分析问题

• C# HttpClient测试好几种调用方法都不行，估计是POSTMAN的http post与C# HttpClient post有细节差异，启用Charles抓包分析

• Charles抓包分析结果：C# HttpClient post头部多了：Expect:100-continue

解决方法

• C# HttpClient post头默认带：Expect:100-continue，DefaultRequestHeaders.ExpectContinue = false即可去除。

  using (var client = new HttpClient())
  {
      client.DefaultRequestHeaders.ExpectContinue = false;
  }