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Introduction
The server has received the first part of a request and has not yet denied it. After the request has been fully received and processed, the server plans to provide a final answer.
HTTP Status Code 100 Continue is an HTTP/1.1 response message with a status code of 100. The response signifies that the server has accepted the request and will continue to process it, as opposed to refusing it due to some violation of its rules.
HTTP Status Code 100 Continue is a response to requests which looks for a new representation and can be sent by servers in spite of malformed requests or other violations of the valid specifications that are being applied on them. It’s also used when one or more intermediate caches need to validate content before serving it but wish to receive one or more new representations from the origin server before sending a final reply.
The client can ignore this intermediate answer if the request does not include an Expect header field with the 100-continue expectation.
Status
100 Continue
Specifications
Browser compatibility

Full Support
FAQs
What does expect 100 Continue mean?
The server has received the first part of a request and has not yet denied it. After the request has been fully received and processed, the server plans to provide a final answer.
What to do when the 100 continue response occurs?
The client can ignore this intermediate answer if the request does not include an Expect header field with the 100-continue expectation.
Related Post:
HTTP Status Code 300-Multiple Choices
HTTP Status Code 204 – No Content
HTTP Status Code 203 – Non-authoritative Information
HTTP Status Code 207 Multi-Status
HTTP Status Code 208 Already Reported
HTTP Status Code 400 Bad Request
HTTP Status Code 401 Unauthorized
HTTP Status Code 403 Forbidden Error
HTTP Status Code 404 Not Found
HTTP Status Code 405 Method Not Allowed
HTTP Status Code 411 Length Required
Conclusion
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Kedar Dangal
Making a difference, Adding the sum.