Requesting API informations in c#

Question

I am trying to get information from the Scopus API ( made for python ), but i'm using C# mvc ( have to ). I am to the point that thats to the api Url : "https://api.elsevier.com/" and api key "3b...", i try to make a request this way :

private readonly ScopusSearchClient apiClient = new ScopusSearchClient("https://api.elsevier.com/", "3b...");

Where ScopusSearchClient refers to :

public ApiClient(string apiUrl, string apiKey)
    {
        _apiUrl = apiUrl;
        _apiKey = apiKey;
        _httpClient = new HttpClient
        {
            BaseAddress = new Uri(_apiUrl)
        };
    }

(ScopusSearchClient is linked to ApiClient which allows me to do that).

I then try and execute an actual request through :

var scopusSearchResult = await apiClient.GetAsync<SearchResults<Scopus>>("content/search/scopus", "query=AF-ID(Harvard Medical School 3000604");

Which is the function :

public async Task<T> GetAsync<T>(string endpoint, string parameters = null) where T : HttpStatusResource
    {
        HttpResponseMessage httpResponseMessage = await _httpClient.GetAsync(Utilities.GenerateRequestUri(_apiUrl, endpoint, _apiKey, parameters));
        string strContent = await httpResponseMessage.Content.ReadAsStringAsync();
        var result = JsonConvert.DeserializeObject<T>(strContent);
        result.IsSuccessStatusCode = httpResponseMessage.IsSuccessStatusCode;
        result.StatusCode = httpResponseMessage.StatusCode;
        return result;
    }

The problem is, as I connect I receive the error :

A connection attempt failed because the connected party did not respond properly beyond a certain time or an established connection failed because the connection host did not respond 104.XX.XX.XX:XXX

And it comes from the line

var scopusSearchResult = await apiClient.GetAsync<SearchResults<Scopus>>("content/search/scopus", "query=AF-ID(Harvard Medical School 3000604");

In the controller.

Does anybody have any idea of what is going on ? Thank you very much, Gauthier

Answer 1

It was in the end a problem of firewall, blocking some IPs, including the one of the URL which we are querying to get information from the API. Unblock it throught the firewall !