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SOAP

XML based

Example of a SOAP req. Skeleton:

<?xml version="1.0"?>  
  
<soap:Envelope  
xmlns:soap="http://www.w3.org/2003/05/soap-envelope"  
soap:encodingStyle="http://www.w3.org/2003/05/soap-encoding">  
  
<soap:Header>  
...  
</soap:Header>  
  
<soap:Body>  
...  
  <soap:Fault>  
  ...  
  </soap:Fault>  
</soap:Body>  
  
</soap:Envelope>

GRPC: gRPC

Web Hooks & Server Side events (SSE): Web Hook & SSE

REST API

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Client -> Server request (usually HTTP on TCP)
Then Server -> Client request (same Stream)

Graph QL: Graph QL