Postman multipart/form-data error: Missing start boundary

java multipart postman
Anton Belev picture Anton Belev · Oct 16, 2015 · Viewed 31.5k times · Source

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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Answer

Anton Belev picture Anton Belev · Oct 16, 2015

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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