Translate Python requests code to Java (UniRest)

Question

I am working with the Snapchat API to make a Java Client. I am using an endpoint which takes the following parameters from an HTTP POST:

{
username: snapchat username,
timestamp: UNIX timestamp,
media_id: random string,
type: 0,
req_token: request token,
data: encrypted data
}

I have no problem generating the params hash, and I have the data as a File object.

In Python I have confirmed that the following works:

f = open('encrypted.jpg')
params = { ... all params besides data ... }
files = { 'data' : f }
r = requests.post(path, params, files=files)

That Python code gets me a 200. I am using tokens and data/files generated by Java code, so the data sent is identical.

In Java I am doing the following with UniRest:

Map<String, Object> params = ... same params ...;
File f = new File('encrypted.jpg');
HttpRequestWithBody req = Unirest.post(path);
req.fields(params);
req.field("data", f);
HttpResponse<String> resp = req.asString();

However this gives me a 500 response from the server. How can I write Java that emulates the Python exactly? Or how can I snoop my own network traffic to see the difference in what the code for each is doing? Seems crazy to me that one works and the other does not.

Answer 1

try to chain methods, i.e.

req = Unirest.post(path).fields(params).field("data", f);

or change the lines:

req = req.fields(params); 
req = req.field("data", f);