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TypeScript Microservices by Parth Ghiya

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1xx – informational 

The 1xx code provides primitive functionalities, such as operations happening in the background, switching protocols, or the state of the initial request. For example, 100 Continue indicates that the server has received request headers and is now awaiting the request body, 101 Switching Protocols indicates that the client has requested a protocol change from the server and the request has been approved, and 102 indicates that the operation is happening in the background and will take time to complete.

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