java - How to add headers to OkHttp request interceptor? -

i have interceptor add okhttp client:

public class requesttokeninterceptor implements interceptor { @override public response intercept(chain chain) throws ioexception {   request request = chain.request();   // here we'll try refresh token.   // retrofit call   // after succeed we'll proceed our request   response response = chain.proceed(request);   return response; } } 

how can add headers request in interceptor?

i tried making mistake , lose request when creating new request:

    public class requesttokeninterceptor implements interceptor {     @override     public response intercept(interceptor.chain chain) throws ioexception {         request request = chain.request();         request newrequest;          try {             log.d("addheader", "before");             string token = tokenprovider.getinstance(mcontext).gettoken();             newrequest = request.newbuilder()                     .addheader(headerscontract.header_authonrization, o_auth_authentication + token)                     .addheader(headerscontract.header_client_id, client_id)                     .build();         } catch (exception e) {             log.d("addheader", "error");             e.printstacktrace();             return chain.proceed(request);         }          log.d("addheader", "after");         return chain.proceed(newrequest);     } } 

note that, know can add header when creating request this:

request request = new request.builder()     .url("https://api.github.com/repos/square/okhttp/issues")     .header("user-agent", "okhttp headers.java")     .addheader("accept", "application/json; q=0.5")     .addheader("accept", "application/vnd.github.v3+json")     .build(); 

but doesn't fit needs. need in interceptor.

finally, added headers way:

@override     public response intercept(interceptor.chain chain) throws ioexception {         request request = chain.request();         request newrequest;          newrequest = request.newbuilder()                 .addheader(headerscontract.header_authonrization, o_auth_authentication)                 .addheader(headerscontract.header_x_client_id, client_id)                 .build();         return chain.proceed(newrequest);     }