Optimizing Get Requests - Changing RoundTripper with Transport go - http

Question

I reach a limit in the number of requests I can get using the default httpClient that my API wrapper provides.
//I was getting something like this at the beginning
Head www.example.com:80/: lookup example.com: no such host
To solve this I want to change the MaxIdleConnsPerHost setting for the httpClient.Transport of my client. It looks much more like this:
However, the Transport my client uses is a RoundTripper and subsequently, it doesn't have a MaxIdleConnsPerHost param.
&oauth2.Transport{Source:(*oauth2.reuseTokenSource)(0xc2082ac0c0),
Base:http.RoundTripper(nil),
mu:sync.Mutex{state:0, sema:0x0},
modReq:map[*http.Request]*http.Request(nil)
}
The one I'm providing is mostly a default one and it lacks the proper configuration I suppose or simple what I want to do is not feasible.
&http.Transport{idleMu:sync.Mutex{state:0, sema:0x0},
idleConn:map[http.connectMethodKey][]*http.persistConn(nil),
idleConnCh:map[http.connectMethodKey]chan *http.persistConn(nil),
reqMu:sync.Mutex{state:0, sema:0x0},
reqCanceler:map[*http.Request]func()(nil),
altMu:sync.RWMutex{w:sync.Mutex{state:0, sema:0x0},
writerSem:0x0,
readerSem:0x0,
readerCount:0,
readerWait:0},
altProto:map[string]http.RoundTripper(nil),
Proxy:(func(*http.Request) (*url.URL, error))(nil),
Dial:(func(string, string) (net.Conn, error))(nil),
TLSClientConfig:(*tls.Config)(nil),
TLSHandshakeTimeout:0,
DisableKeepAlives:false,
DisableCompression:false,
MaxIdleConnsPerHost:200,
ResponseHeaderTimeout:0}
Can someone guide me on the right direction?