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Boundary refused characters

New Contributor

Boundary refused characters



When I execute a post with an attachment, Load UI generates a boundary (I already removed the quotes) like this

Content-Type: multipart/form-data; boundary="----=_Part_63_784287734.1559741312548"


And the "Attachment part"

Content-Type: application/pdf
Content-Disposition: form-data; name="file"; filename="DPA Piece 1.pdf"


The access management of our application refuse (I think) some characters within the name of the boundary section:

I find in the logs

HTTP 403

[msg "Failed to parse request body."] [data "Multipart: Invalid boundary in C-T (characters)."] [severity "CRITICAL"] [ver "OWASP_CRS/3.0.0"]


When I execute from a web brower with a name = ------WebKitFormBoundaryCz9zYIwaDfkUV9bO, I don't have the issue.


Any idea how to change he name of the boundary?




Re: Boundary refused characters

Hi @odesmaele,


You can modify the boundary value using the RequestFilter.filterRequest event handler, please see an example here:


But, ReadyAPI is working according to the HTTP standards:


So, it's better to check whether your server follows the standards.

Customer Care Team

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New Contributor

Re: Boundary refused characters

I'll check with development team if standards are respected. Thanks for your answer


Re: Boundary refused characters

Hi all,


Thanks for your reply, @Nastya_Khovrina !

@odesmaele did you have a chance to check this? Is the question answered?

We are looking forward to hearing from you.


Olga Terentieva,
SmartBear Assistant Community Manager

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