Google Sheets API POST请求

Question

通过httpClient.POST方法，我总是得到-1作为响应，您不知道为什么吗？如果我尝试过帐到另一个端点（不是Google API），那么一切都会很好。

void sendMeasuredData() {
  Serial << "Sending data to Google Sheets" <<endl;
  StaticJsonBuffer<250> JSONBuffer;
  JsonObject& JSONencoder = JSONBuffer.createObject();

  JSONencoder["range"] = "Measurements!A1:C1";
  JSONencoder["majorDimension"] = "ROWS";

  JsonArray& values = JSONencoder.createNestedArray("values"); //JSON array
  values.add("TIMESTAMP"); //Add value to array
  values.add(temperature); //Add value to array
  values.add(humidity); //Add value to array

  char JSONmessageBuffer[250];
  JSONencoder.prettyPrintTo(JSONmessageBuffer, sizeof(JSONmessageBuffer));
  Serial << JSONmessageBuffer << endl;

  HTTPClient httpClient;
  httpClient.begin("https://sheets.googleapis.com/v4/spreadsheets/SPREADSHEET_ID/values/Measurements!A1:C1:append?valueInputOption=USER_ENTERED","F9:C3:81:B3:84:13:E8:94:87:B1:87:6D:8A:15:75:27:09:56:93:BE");

  httpClient.addHeader("Content-Type", "application/json");
  httpClient.addHeader("Authorization", "Bearer "+access_token);  

  int httpCode = httpClient.POST(JSONmessageBuffer); 
  String payload = httpClient.getString();
  Serial << "GoogleSheets Response: " << httpCode << endl;
  Serial << payload << endl;

  httpClient.end();
}