fixes #300 (#304)

vripper-core/src/main/kotlin/me/vripper/host/Host.kt

@@ -171,9 +171,9 @@ internal abstract class Host(
     fun <T> fetch(
         url: String,
         context: Context,
-        referer: String = "https://vipergirls.to/",
         transformer: (ClassicHttpResponse) -> T
     ): T {
+        val referer = context.headers["Referer"] ?: "https://vipergirls.to/"
         val httpGet =
             HttpGet(url).also {
                 it.addHeader("Referer", referer)

vripper-core/src/main/kotlin/me/vripper/host/ViprImHost.kt

@@ -35,6 +35,7 @@ internal class ViprImHost : Host("vipr.im", 15) {
                     .map { obj: Node -> obj.textContent }
                     .map { obj: String -> obj.trim() }.orElse(null)
             val imgUrl = imgNode.attributes.getNamedItem("src").textContent.trim()
+            context.headers["Referer"] = "https://vipr.im/"
             Pair(imgTitle!!, imgUrl)
         } catch (e: Exception) {
             throw HostException("Unexpected error occurred", e)

vripper-core/src/main/kotlin/me/vripper/services/download/ImageDownloadRunnable.kt

@@ -49,6 +49,7 @@ internal class ImageDownloadRunnable(
             cookieStore = HTTPService.cookieStore
         }
         val requests = mutableListOf<HttpUriRequestBase>()
+        val headers = mutableMapOf<String, String>()
 
         init {
             ApplicationProperties.VRIPPER_DIR.listDirectoryEntries()