Request format is unrecognized for URL unexpectedly ending in

This error occurred to me when I try to call web service (asmx) from SharePoint provider hosted app. asmx is written to retrieve some list data from SharePoint app host web.

I found that this error occurs because of missing configuration in the web.config.

<system.web>
    <webServices>
        <protocols>
            <add name="HttpGet"/>
            <add name="HttpPost"/>
        </protocols>
    </webServices>
 </system.web>

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