Rest Api Error 400

Hello, I'm using Aras Innovator 11.0 SP12 and i'm trying to get specific items using the rest API and the following request : localhost/.../Part eq '1' Tryning with postman, no problem, i retrieve the good item. But with my tiny java client, i have the following error : java.io.IOException: Server returned HTTP response code: 400 for URL: localhost/.../Part eq '1 ' at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) You can see the URL is clearly the same as the one i test in Postman. Any ideas ? Thank you !