go-swagger: POST client request gets a 415 response

Problem statement

When I send a POST request using the client API, I get a 415 (Unsupported Media Type) response. I noticed that the request has an extra header that sets “Transfer-Encoding: chunked”. On the other hand, sending the POST request via curl works fine because it doesn’t have that header.

This is my first go-swagger client and server. So, it is likely that I am doing something wrong, either in the code or in the swagger specification file.

Here is the request and response:

POST /api/v1/keys/k?value=v HTTP/1.1
Host: localhost:8001
User-Agent: Go-http-client/1.1
Transfer-Encoding: chunked
Accept: application/json
Accept-Encoding: gzip

0


HTTP/1.1 415 Unsupported Media Type
Connection: close
Content-Length: 113
Content-Type: application/json
Date: Mon, 23 Jan 2017 17:39:22 GMT

{"code":415,"message":"unsupported media type \"application/octet-stream\", only [application/json] are allowed"}
Error: unknown error (status 415): {resp:0xc4202ac120} 

And here is the error client is receiving:

&runtime.APIError{OperationName:"unknown error", Response:client.response{resp:(*http.Response)(0xc420090870)}, Code:415}

Swagger specification

swagger: '2.0'
info:
  version: "0.0.0"
  title: Testman
schemes:
  - http
host: localhost
basePath: /api/v1
produces:
  - application/json
consumes:
  - application/json
paths:
  /keys/{key}:
    get:
      parameters:
        - name: key
          in: path
          required: true
          type: string
      responses:
        200:
          description: Successful response
        404:
          description: Not found
    post:
      parameters:
        - name: key
          in: path
          required: true
          type: string
        - name: value
          in: query
          required: true
          type: string
      responses:
        200:
          description: Successful response

Steps to reproduce

I pushed everything needed to reproduce this issue at https://github.com/siadat/swagger-eg

Environment

Swagger version: 2.0 Go version: go version devel +6a3c6c0 Sat Jan 14 05:57:07 2017 +0000 linux/amd64 OS: linux