4.1HttpMultipartFormDataBuilder Form Builder
Created on Aug 17, 2026~1 min read
In internet applications, the most common way to save user-defined data is form submission using Form. Form forms can transmit not only text data but also binary data (such as files).
To build content containing these multipart forms, we use the HttpMultipartFormDataBuilder form builder. This builder ultimately produces a MultipartFormDataContent object, sets it as the Content property of the HttpRequestMessage, and specifies the request's content type as multipart/form-data.