Apply preprocessing into HLS stream

src/main/java/com/backend/hls/proxy/dto/CreateProxyDTO.java

@@ -0,0 +1,19 @@
+package com.backend.hls.proxy.dto;
+
+import jakarta.validation.constraints.NotEmpty;
+import jakarta.validation.constraints.NotNull;
+
+public class CreateProxyDTO {
+    @NotNull
+    @NotEmpty
+    private final String url;
+
+    public CreateProxyDTO(String url) {
+        this.url = url;
+    }
+
+    public String getUrl() {
+        return url;
+    }
+
+}