Postman multipart/form-data error: Missing start boundary

Question

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?

I don't know Postman so I can't answer your question, but the boundaries delimit each part of a multipart/* message. It is first defined in the message main part then used in between each part. It is expected that Postman should handle this kind of technical details, so just make sure you use it correctly. — Aaron, Oct 16 '15 at 15:36
very strange, if I remove the Content-Type multipart/form-data from my header I'm able to hit my endpoint ... — Anton Belev, Oct 16 '15 at 15:41

score 34 · Accepted Answer · answered Oct 16 '15 at 15:43

34

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.

answered Oct 16 '15 at 15:43

Anton Belev

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Removing the header is causing the header to be set to `multipart/octetstream` which is causing `"Content type 'application/octet-stream' not supported"` – shyam Mar 22 '17 at 13:06

score 8 · Answer 2 · answered Nov 04 '16 at 03:03

8

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:

answered Nov 04 '16 at 03:03

realPK

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It seems the key (in this case 'media') is the name attribute of the input tag, right? – ABC123 Mar 03 '20 at 22:48

score -1 · Answer 3 · answered Nov 04 '16 at 03:09

As a work around try this:

spring: jersey: application-path: /rest # Path that serves as the base URI for the application. Overrides the value of "@ApplicationPath" if specified. filter.order: 0 # Jersey filter chain order. type: servlet # Can be either "servlet" or "filter". init.*:

type servlet worked fine, where as filter is throwing the Start Boundary error.

Postman multipart/form-data error: Missing start boundary

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