get Runtime Error in nodeJs with response

  1. i am using request node module for sent the API request, but get something Runtime Error with my response, here is my response with Error.

        <!DOCTYPE html>
    <html>
    
    <head>
        <title>Runtime Error</title>
        <meta name="viewport" content="width=device-width" />
        <style>
            body {font-family: "Verdana";font-weight: normal;font-size: .7em;color: black;}
            p {font-family: "Verdana";font-weight: normal;color: black;margin-top: -5px}
            b {font-family: "Verdana";font-weight: bold;color: black;margin-top: -5px}
            H1 {font-family: "Verdana";font-weight: normal;font-size: 18pt;color: red}
            H2 {font-family: "Verdana";font-weight: normal;font-size: 14pt;color: maroon}
            pre {font-family: "Consolas", "Lucida Console", Monospace;font-size: 11pt;margin: 0;padding: 0.5em;line-height: 14pt}
            .marker {font-weight: bold;color: black;text-decoration: none;}
            .version {color: gray;}
            .error {margin-bottom: 10px;}
            .expandable {text-decoration: underline;font-weight: bold;color: navy;cursor: hand;}
            @media screen and (max-width: 639px) {pre {width: 440px;overflow: auto;white-space: pre-wrap;word-wrap: break-word;}}
            @media screen and (max-width: 479px) {pre {width: 280px;}}
        </style>
    </head>
    
    <body bgcolor="white">
        <span><H1>Server Error in '/DataService' Application.<hr width=100% size=1 color=silver></H1>
            <h2> <i>Runtime Error</i> </h2>
        </span>
        <font face="Arial, Helvetica, Geneva, SunSans-Regular, sans-serif ">
            <b> Description: </b>An application error occurred on the server. The current custom error settings for this
            application prevent the details of the application error from being viewed remotely (for security reasons). It
            could, however, be viewed by browsers running on the local server machine.
            <br><br>
    
            <b>Details:</b> To enable the details of this specific error message to be viewable on remote machines, please
            create a <customErrors> tag within a "web.config" configuration file located in the root
            directory of the current web application. This <customErrors> tag should then have its "mode"
            attribute set to "Off".<br><br>
    
            <table width=100% bgcolor="#ffffcc">
                <tr>
                    <td>
                        <code>
                            <pre>
                            <!-- Web.Config Configuration File -->
                            <configuration>
                                <system.web>
                                <customErrors mode="Off"/>
                                </system.web>
                            </configuration>
                            </pre>
                        </code>
                    </td>
                </tr>
            </table>
    
            <br>
            <b>Notes:</b> The current error page you are seeing can be replaced by a custom error page by modifying the
            "defaultRedirect" attribute of the application&#39;s <customErrors> configuration tag to point
            to a custom error page URL.<br><br>
    
            <table width=100% bgcolor="#ffffcc">
                <tr>
                    <td>
                        <code>
                            <pre>
                            <!-- Web.Config Configuration File -->
    
                            <configuration>
                            <system.web>
                            <customErrors mode="RemoteOnly" 
                            defaultRedirect="mycustompage.htm"/>
                            </system.web>
                            </configuration>
                            </pre>
                        </code>
                    </td>
                </tr>
            </table>
    
  2. i am using node module request and using request.post method to get response, but sometimes get response like above.

i got response like this, i dont know why i am getting this, if i delete my web.config file then also it gives same error