HTTP
100 Continue
The server has received the request headers and the client should proceed to send the request body. This lets the client know it can continue with the request or abort if the headers were rejected.
Quando você vê este código
When a client sends an Expect: 100-continue header, the server responds with 100 before the client sends the body.
Como corrigir
This is an interim response — no fix needed. The client should continue sending the request body.
Especificação
Ver RFC / Especificação →Guias
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