using System.Net.Http.Headers;
var url = "https://www.avito.ru/moskva/vakansii?context=H4sIAAAAAAAA_0q0MrSqLraysFJKK8rPDUhMT1WyLrYyNLNSKk5NLErOcMsvyg3PTElPLVGyrgUEAAD__xf8iH4tAAAA&q=Python+%D1%80%D0%B0%D0%B7%D1%80%D0%B0%D0%B1%D0%BE%D1%82%D1%87%D0%B8%D0%BA";
using var httpClient = new HttpClient();
httpClient.DefaultRequestHeaders.Add("accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9");
httpClient.DefaultRequestHeaders.Add("accept-language", "ru-RU,ru;q=0.9,en-US;q=0.8,en;q=0.7");
httpClient.DefaultRequestHeaders.Add("user-agent", "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36");
httpClient.DefaultRequestHeaders.CacheControl = new CacheControlHeaderValue { NoCache = true };
var response = await httpClient.GetAsync(url);