<para><emphasis role='bold'>Return Codes</emphasis></para>
<itemizedlist>
<listitem>
	<para><emphasis role='bold'>1</emphasis> - Success
	</para>
</listitem>
<listitem>
	<para><emphasis role='bold'>-1</emphasis> - Connection Refused.
	</para>
</listitem>
<listitem>
	<para><emphasis role='bold'>-2</emphasis> - Connection Timeout
	(the <xref linkend="param_connection_timeout"/> was exceeded
	before a TCP connection could be established)
	</para>
</listitem>
<listitem>
	<para><emphasis role='bold'>-3</emphasis> - Transfer Timeout
	(the <xref linkend="param_curl_timeout"/> was exceeded before the
	last byte was received). The <emphasis>retcode_pv</emphasis> may
	be set to 200 or 0, depending whether a 200 OK was received or not.
	If it was, the <emphasis>body_pv</emphasis> will contain partially
	downloaded data, use at your own risk! (we recommend you only use
	this data for logging / debugging purposes)
	</para>
</listitem>
<listitem>
	<para><emphasis role='bold'>-4</emphasis> - Already Connecting
	(another OpenSIPS worker is already connecting to this URL hostname.
	Consult <xref linkend="param_no_concurrent_connects"/> for more info).
	</para>
</listitem>
<listitem>
	<para><emphasis role='bold'>-10</emphasis> - Internal Error (out of
		memory, unexpected libcurl error, etc.)
	</para>
</listitem>
</itemizedlist>
