Curl multipart form data boundary example, Learn how to send multipart form data with curl including file uploads, form fields, and advanced multipart configurations for web scraping. It is an HTTP POST request sent with the request body specially formatted as a series of parts, separated with MIME boundaries. Jan 16, 2026 · In this blog, we’ll demystify multipart/form-data, walk through how to properly use curl for file uploads, and deep dive into troubleshooting Content-Length issues. * The imaginary form we fill in looks like:. Oct 1, 2013 · For example the --data option offers a similar mechanism for uploading files as data, but the Content-Type header is set to application/x-www-form-urlencoded whereas with --form, it is set to multipart/form-data. * </DESC> */ /* Example code that uploads a filename 'foo' to a remote script that accepts. Sending files together with JSON in one multipart submission avoids race conditions between separate requests and keeps related data tightly coupled for operations such as image uploads, log bundles, and backup imports. We'll use the Sora 2 image-to-video API as a practical example to help you master the core skills of API file uploading. * "HTML form based" (as described in RFC 1738) uploads using HTTP POST. A multipart formpost is what an HTTP client sends when an HTML form is submitted with enctype set to multipart/form-data. * HTTP Multipart formpost with file upload and two additional parts. Jan 28, 2026 · In this post, we'll dive into how the multipart/form-data encoding works.
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