if (this.headers == null) {
headers = new IdentityHashMap<>();
}
headers.put(key, val);
return this;
<BUG>}
public OkHttpProxy files(Pair<String, File>... files) {</BUG>
this.files = files;
return this;
}

if (this.headers == null) {
headers = new IdentityHashMap<>();
}
headers.put(key, val);
return this;
}
public OkHttpProxy file(File file) {
this.file = file;
return this;
}
public OkHttpProxy files(Pair<String, File>... files) {
this.files = files;
return this;
}
