CODEWITHSUNDEEP
javadockerhttp-posthttpclientapache-httpclient-4.x
Glauber Néspoli
Glauber Néspoli

Reputation: 2581

Apache httpcomponent returns java.net.UnknownHostException: Name or service not known

I'm trying to make an oauth login with Instagram using Apache Httpcomponents 4.5.1, but failing to succeed at getting the access token.

I'm pretty sure it's a problem with the library itself, since if I curl I get the result I wish.

So, I've trying a few different ways of doing the post call, but all of them gives me the same result, so I'll just post the most elegant way I found is using the fluent-hc lib:

@Value("${instagram.client.id}")
private String clientID;

@Value("${instagram.client.secret}")
private String clientSecret;

@Value("${instagram.redirect.uri}")
private String redirectURI;

private static final String INSTAGRAM_ACCESS_TOKEN_URL = "https://api.instagram.com/oauth/access_token";    

private Content requestAccessToken(String code, UserType userType) throws IOException {
//      String authorization_header_string = URLEncoder.encode(clientID + ":" + clientSecret, "UTF-8");
        return Request.Post(INSTAGRAM_ACCESS_TOKEN_URL)
                .bodyForm(Form.form()
                        .add("client_id",  clientID)
                        .add("client_secret", clientSecret)
                        .add("grant_type", "authorization_code")
                        .add("redirect_uri", redirectURI + "?type=" + userType)
                        .add("code", code)
                        .build())
//              .addHeader("Authorization", authorization_header_string)
                .execute().returnContent();
    }

And the result I get is:

java.net.UnknownHostException: api.instagram.com: Name or service not known java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:922) java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1316) java.net.InetAddress.getAllByName0(InetAddress.java:1269) java.net.InetAddress.getAllByName(InetAddress.java:1185) java.net.InetAddress.getAllByName(InetAddress.java:1119) org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45) org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:111) org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:353) org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:380) org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236) org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184) org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88) org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110) org.apache.http.impl.client.InternaleHttpClient.execute(CloseableHttpClient.java:82) org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:55) org.apache.http.client.fluent.Request.internalExecute(Request.java:173) org.apache.http.client.fluent.Request.execute(Request.java:177)HttpClient.doExecute(InternalHttpClient.java:184) org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82) org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:55) org.apache.http.client.fluent.Request.internalExecute(Request.java:173) org.apache.http.client.fluent.Request.execute(Request.java:177)

Right now I have no idea how to proceed. Every way I make this request using this lib returns me this error. Tried to add the Authentication header passing key:secret but also didn't work.

What am I missing?

PS: I'm using docker.

Upvotes: 1

Views: 3117

Answers (2)

Glauber Néspoli
Glauber Néspoli

Reputation: 2581

OK. It does indeed has to do with Docker. The moment I tried to run the code outside Docker it worked.

So, what I did was:

$ ping api.instagram.com

PING instagram.c10r.facebook.com (173.252.120.81) 56(84) bytes of data.

64 bytes from instagram-p3-shv-12-frc3.fbcdn.net (173.252.120.81): icmp_seq=1 ttl=74 time=146 ms

And since I'm using docker-compose, I added to my common.yml config:

  extra_hosts:
    - "api.instagram.com:173.252.120.81"

And now it's working just fine.

Upvotes: 1

corykim
corykim

Reputation: 56

Your code example does not seem to be using the HttpComponents API. Based on the example from the tutorial, I produced this code. It returns a 400 response, because it is in fact a bad request, but at least it does get a response.

public class HttpClientExample {
  private static final String INSTAGRAM_ACCESS_TOKEN_URL = "https://api.instagram.com/oauth/access_token";

  public static void main(String[] args) throws IOException {
    List<NameValuePair> formParams = new ArrayList<NameValuePair>();
    formParams.add(new BasicNameValuePair("client_id",  "someValue"));
    formParams.add(new BasicNameValuePair("client_secret",  "someValue"));
    formParams.add(new BasicNameValuePair("grant_type",  "someValue"));
    formParams.add(new BasicNameValuePair("redirect_uri",  "someValue"));
    formParams.add(new BasicNameValuePair("code",  "someValue"));

    UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formParams, Consts.UTF_8);

    HttpPost post = new HttpPost(INSTAGRAM_ACCESS_TOKEN_URL);
    post.setEntity(entity);

    HttpClient client = HttpClients.createDefault();
    HttpResponse response = client.execute(post);

    System.out.println(response.getStatusLine());
    System.out.println(response.getEntity());
  }
}

Upvotes: 0

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