Download API Post Request Field length limit

[BLamb]

I'm trying to send a post request with the download tool to call an API using a data dictionary. This dictionary is limited to a sample of 1000 unique identifiers that are 8 characters long. Whenever the API is called I get a 400 Bad Request error. However, when I limit the sample size to 10, the API calls and returns a success. 

Is there a field limit length for sending an API Call? The payload is sent with 'Take query String/Body from field' 

[apathetichell]

can you share api specs? This is probably on the API side - not the Alteryx side. limits for this field in Alteryx are pretty big (max vw_string size).

[BLamb]

I have looked into it - looked as though a field was set up incorrectly in the download tool. I was adding field data to the headers. Not sure why this worked for the small run but I have unchecked the box and seems to be working fine now.