[Solved] No matching function call for ostringstream `.str()`

by

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When you do

writeSite(body.str(), "application/json");

the string object returned by body.str() is temporary. And non-constant references can not bind to temporary objects.

A simple solution is to make the site argument const just like you have done for the contentType argument (which would otherwise suffer from the same problem).

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solved No matching function call for ostringstream `.str()`