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I'm trying to hit my server's endpoint with a multipart/form-data request sent from Postman. I'm getting a 400 Bad Request and the cause is:
org.jvnet.mimepull.MIMEParsingException: Missing start boundary.
How can I set the start boundary and how do I know what it should be?
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The boundary is included to separate name/value pair in the multipart/form-data . The boundary parameter acts like a marker for each pair of name and value in the multipart/form-data. The boundary parameter is automatically added to the Content-Type in the http (Hyper Text Transfer Protocol) request header.
multipart/form-data contains boundary to separate name/value pairs. The boundary acts like a marker of each chunk of name/value pairs passed when a form gets submitted. The boundary is automatically added to a content-type of a request header.
UPDATE: I have created a video on sending multipart/form-data requests to explain this better. Actually, Postman can do this. You DON'T need to add any headers, Postman will do this for you automatically. Be careful with explicit Content-Type header.
https://github.com/postmanlabs/postman-app-support/issues/191 Following that thread here seems that setting the request header to Content-Type multipart/form-data I'm overriding the value set by Postman.
There is no need to add a content-type header manually. You are overriding the value set by Postman. Just select form-data in POST request and send your request to see if it works.
Removing the header allowed me to hit my endpoint.
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Overriding POSTMAN header values is the issue as mentioned by Anton above. Here is how your headers and request body should look like for standalone POSTMAN client:
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