http post tracement(/v3/segments) does not work

[haroldjiang]

Please answer these questions before submitting your issue.

• Why do you submit this issue?
• Bug

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Bug

• Which version of SkyWalking(8.5), OS(mac 10.12), and JRE(1.8)?

• Which company or project? self use

• What happened?
  If possible, provide a way to reproduce the error. e.g. demo application, component version.
  setup local single-sever mode,try to send tracement data via v3/segments;then go to skywalking ui to check,and there is no data.
  request post body use the sample data in skywalking doc:
  [{
  "traceId": "a12ff60b-5807-463b-a1f8-fb1c8608219e",
  "serviceInstance": "User_Service_Instance_Name",
  "spans": [{
  "operationName": "/ingress",
  "startTime": 1588664577013,
  "endTime": 1588664577028,
  "spanType": "Exit",
  "spanId": 1,
  "isError": false,
  "parentSpanId": 0,
  "componentId": 6000,
  "peer": "upstream service",
  "spanLayer": "Http"
  }, {
  "operationName": "/ingress",
  "startTime": 1588664577013,
  "tags": [{
  "key": "http.method",
  "value": "GET"
  }, {
  "key": "http.params",
  "value": "http://localhost/ingress"
  }],
  "endTime": 1588664577028,
  "spanType": "Entry",
  "spanId": 0,
  "parentSpanId": -1,
  "isError": false,
  "spanLayer": "Http",
  "componentId": 6000
  }],
  "service": "User_Service_Name",
  "traceSegmentId": "a12ff60b-5807-463b-a1f8-fb1c8608219e"
  }, {
  "traceId": "f956699e-5106-4ea3-95e5-da748c55bac1",
  "serviceInstance": "User_Service_Instance_Name",
  "spans": [{
  "operationName": "/ingress",
  "startTime": 1588664577250,
  "endTime": 1588664577250,
  "spanType": "Exit",
  "spanId": 1,
  "isError": false,
  "parentSpanId": 0,
  "componentId": 6000,
  "peer": "upstream service",
  "spanLayer": "Http"
  }, {
  "operationName": "/ingress",
  "startTime": 1588664577250,
  "tags": [{
  "key": "http.method",
  "value": "GET"
  }, {
  "key": "http.params",
  "value": "http://localhost/ingress"
  }],
  "endTime": 1588664577250,
  "spanType": "Entry",
  "spanId": 0,
  "parentSpanId": -1,
  "isError": false,
  "spanLayer": "Http",
  "componentId": 6000
  }],
  "service": "User_Service_Name",
  "traceSegmentId": "f956699e-5106-4ea3-95e5-da748c55bac1"
  }]

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Requirement or improvement

• Please describe your requirements or improvement suggestions.
• hope to make this api v3/segments work

[wu-sheng]

Please debug by yourself. The demo ENV is using this as APISIX tracer reporting in this way.