POST multiple binary files as multipart/form-data without using the Multipart Node in KNIME HUB

[akhil2698]

I’m trying to send a POST request with multiple binary files (an audio file and a XML metadata) as multipart/form-data. Unfortunately, I cannot use the Multipart Encoded HTTP Entity Creator node since it’s a Palladian node. Is there any other workaround/components?

Thanks.

[akhil2698]

@Certified-Trainers requesting your help on this.

[mwiegand]

Hi @akhil2698,

this is highly specific and in order to provide any assitance, more details would be required. Can you share the workflow or more details about the endpoint please?

Best, Mike
CTO @ DataNautics GmbH - Your KNIME-Experts
Contact: info@datanautics.gmbh // datanautics.gmbh // +49(0)170-325 713 9 // Linkedin
Daten Automatisierung für Finanz-, Produktion-, IT- und Marketing-Prozesse mit KNIME

[akhil2698]

Hi @mwiegand, thanks for your response. I’ve managed to build one using Java snippet, and it works.

[takbb]

Glad you managed to build a solution @akhil2698 ,

Unfortunately I did not see you message on 10 September, or I would have responded directly, and indeed a week later I was responding to a similar thread on Multipart encoding

I don’t know if either of these posts in that thread would have resolved your problem, but may also be of interest:

pass file in a POST call

hi @nizamibilal1064 I know its been a few months but I wonder if my “experimental” component can be of assistance, which can build a “multipart message” that can include a file attachment and posted using the POST node. The component is here [image] and there is a demo workflow which posts a json file to the postman echo api here: [image]

pass file in a POST call

Hey @takbb and @nizamibilal1064 , Thank you for sharing your approach — really nice work! Funny enough, we were working on the same problem at the same time. You can find a shared component and workflow example below: Multipart Form-Data Builder (Component) mutlipart-form workflow (Workflow) The main difference is that we tried to avoid script nodes entirely, and we added the option to explicitly define the object type for the multipart call. I wanted to…

[akhil2698]

@akhil2698

Thanks for the reply! No worries at all. Your Mulitpart encoder node and the workflow you’ve built was a huge help and a great starting point. I just used a java snippet to make it work.
That’s exactly the same thing I was looking for: Multipart Form-Data Builder!

Thanks for the reply! No worries at all. Your Mulitpart encoder node and the workflow you’ve built was a huge help and a great starting point. I just used a java snippet to make it work.
That’s exactly the same thing I was looking for: Multipart Form-Data Builder!
Big thanks again for sharing it, really appreciate it!!