Ruby Faraday gem adds Content-type when no body

Question

I am using the Ruby Faraday gem to make some requests to the Bitstamp API.

I want to make a this post request (to get my account balance) with an empty body. The problem that I'm having is that Faraday adds a Content-type header during the execution of the request, I suppose, in a middleware. The Bitstamp API doesn't permit the inclusion of the Content-type header when the body is empty, so I'm getting the following error:

BitstampClient::Error: Bitstamp error: 403 {"status": "error", "reason": "Content-Type header should not be present", "code": "API0020"

How can i exclude the Content-type header? I tested the same request in Postman, and it worked well. So i'm sure that this is the problem.

Which middleware are you using? There definitely are some middleware that add the `Content-Type` header. — Jared Beck, Mar 28 '22 at 17:54

score 0 · Accepted Answer · answered Mar 28 '22 at 20:45

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My builder is the following: <Faraday::RackBuilder:0x000000401e9f2208 @adapter=Faraday::Adapter::NetHttp, @handlers=[Faraday::Request::UrlEncoded]>

Yes, the UrlEncoded middleware adds the Content-Type header. Docs:

The middleware also automatically sets the Content-Type header to application/x-www-form-urlencoded. https://github.com/lostisland/faraday/blob/8f00640dd51da00c8ca09f29bca0a2b32c553925/docs/middleware/request/url_encoded.md

answered Mar 28 '22 at 20:45

Jared Beck

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As you say, the problem was with this middleware. The solution was to empty the `@handlers` list. Thank you! – Federico Mar 28 '22 at 21:29

Ruby Faraday gem adds Content-type when no body

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