public virtual HttpRequestBuilder AddPrefixQueryParam(string key, object value, bool replace = false)
{
if (replace)
{
QueryParams.RemoveAll(v => v.Key == key);
SuffixQueryParams.RemoveAll(v => v.Key == key);
}
QueryParams.Insert(0, new KeyValuePair <string, string>(key, value.ToString()));
return(this);
}