For the operation CelsiusToFahrenheit there are three different message types that the web service make available.
•SOAP 1.1
•SOAP 1.2 and
•HTTP POST
As there is only a single data field being passed, the simplest message type would be to use the HTTP POST:
Posted Message Template
POST /XML/tempconvert.asmx/CelsiusToFahrenheit HTTP/1.1
Host: www.w3schools.com
Content-Type: application/x-www-form-urlencoded
Content-Length: length
Celsius=string
Message Returned Template
HTTP/1.1 200 OK
Content-Type: text/xml; charset=utf-8
Content-Length: length
<?xml version="1.0" encoding="utf-8"?>
<string xmlns="https://www.w3schools.com/xml/">string</string>
Note: the templates displayed by the WSDL, the message header and body are split by a blank line. Placeholders "length" and "string" are hi-lighted in a different color.