HTTP 请求适用于 Postman 但不适用于 Rails

Question

I'm trying to make a HTTP Request to get data from a website. To do that, I have to use a custom header. When I make a request with Postman, by adding well the custom header, everything works fine. When I remove the custom header, I get this error message : {"error": "content not found"} , which is normal.

I tried to make the same request in Rails. This is my code :

uri = URI.parse("https://www.itqi.com/api/master-descriptor")
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true
http.verify_mode = OpenSSL::SSL::VERIFY_NONE
req = Net::HTTP::Get.new(uri.path)
req["itqi-key"] = '************************'
response = http.request(req)

In this case, I added the custom header. But in despite this, I got no data, only this error message : {"error": "content not found"} , like if my custom header was not taken into account. I tried many possibilities without success.

Is there somebody who can help me ? I'm running out of ideas.

Thanks in advance for your advices.

Best regards,

EDIT

Here is my https request with Faraday :

conn = Faraday.new(:url => 'https://www.itqi.com', :ssl => {:verify => false})
response = conn.get do |req|
    req.url '/api/master-descriptor'
    req.headers['Content-Type'] = 'application/json'
    req.headers['itqi-key'] = '********************'
end

And here is the server response :

RESPONSE: #https://www.itqi.com/api/master-descriptor> @request=# @request_headers={"User-Agent"=>"Faraday v0.12.2", "Content-Type"=>"application/json", "itqi-key"=>"**********************"} @ssl=# @response=# @response_headers={"date"=>"Wed, 13 Dec 2017 08:25:53 GMT", "server"=>"Apache/2.4.10 (Debian)", "content-length"=>"29", "connection"=>"close", "content-type"=>"application/json; charset=UTF-8"} @status=404 @reason_phrase="Not Found">>

Always the same problem :(

************************ SOLUTION **************************

After some research, it seems to be that header keys are case sensitive in Rails. So, to resolve the problem, I had to force Rails to put them in lowercase. Without that, Rails systematically capitalized them.

There is my solution :

conn = Faraday.new(url: 'https://www.itqi.com', ssl: {verify: false}) do |conn|
  conn.request :json
  conn.response :json, :content_type => /\bjson$/
  conn.adapter Faraday.default_adapter
end
response = conn.get do |req|
  req.url '/api/master-descriptor'
  itqi_key = CaseSensitiveString.new('itqi-key')
  req.headers[itqi_key] = '************************'
end

class CaseSensitiveString < String
  def downcase
     self
  end
  def capitalize
     self
  end

  def to_s
    self
  end
end

Answer 1

Your code does not look like the example on http://ruby-doc.org/stdlib-2.0.0/libdoc/net/http/rdoc/Net/HTTP.html#label-Setting+Headers .

But I suggest you'll be happier if you switch to Faraday ( https://github.com/lostisland/faraday ).

Answer 2

The answer on this question i found in the same post client, where i can found examples of working query. Postman give me working code for javascript fetch:

  const options: RequestOptions = {
    credentials: 'same-origin',
    headers: {
      'Accept': 'application/json',
    },
    method: method as string,
    mode: 'no-cors',
  }
  if ([RestMethods.post, RestMethods.put].includes(method as RestMethods)) {
    // isn't working:
    // options.headers['Content-Type'] = 'application/json'
    // options.body = JSON.stringify(paramsSnakeCased)
    const urlencoded = new URLSearchParams();
    Object.keys(paramsSnakeCased).forEach((key: string) => {
      urlencoded.append(key, paramsSnakeCased[key])
    })
    options.body = urlencoded
    options.headers['Content-Type'] = 'application/x-www-form-urlencoded'
  }

  fetch(url, options).then(resolve)