Martjin, 

Can you show what the HTTP error code and the message is?
Also, please list all the properties you have set on the InvokeHTTP processor. 
A screenshot works too,

Vijay


> On Apr 26, 2019, at 6:27 AM, Martijn Dekkers <[email protected]> wrote:
> 
> Hi,
> 
> I am working to implement a flow where we need to POST some data to another 
> system using multipart/form-data. This system requires that one of the form 
> fields acts as an attached file. Using curl, this works fine:
> 
> curl -F <field1>=<data1> -F <field2>=<data2> -F <field3>=@[filename] <URL>
> 
> I created a flowfile that mimics what curl sends, including the boundaries 
> etc. Using InvokeHTTP POST I receive a web-server error from the receiving 
> end that mentions a missing parameter.
> 
> Running with curl --trace-ascii or POSTing to a running netcat with both curl 
> and nifi shows exactly the same results, with the exception of the actual 
> boundary marker (which is always different) and some minor header stuff (UA, 
> etc.) The payload is simple text. 
> 
> I understand that there is some difference between sending the data and 
> uploading a file, but am unable to figure out what this is. for example, 
> sending the same data with curl using -F<field3>=<[filename] (instead of 
> @[filename]) also results in an error. 
> 
> I have read a few different messages about POSTing multipart-form data where 
> files need to be uploaded, and most appear to end up with writing a scripted 
> processor or invoking shell. This is particularly undesirable for us given 
> the volume of files we must process, and the speed at which we should be 
> uploading those files. 
> 
> Is there any way in which to mimic the uploading/attaching of a file, instead 
> of sending the data as text?
> 
> Thanks
> 
> Martijn

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