Cannot set headers after they are sent to the client

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Cannot set headers after they are sent to the client

D:\le\node_modules\mysql\lib\protocol\Parser.js: throw err; // Rethrow non-MySQL errors ^ Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the cli ent at ServerResponse.setHeader (_http_outgoing.js::) at ServerResponse.header…

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using System; using System.Web.Services; using YY.SmsPlatform.Common.Objects; using YY.SmsPlatform.Common.UserInterface; using System.Configuration; using System.Text; using System.Net.Http; using System.Threading.Tasks; using System.Xml; using Syste…