fix: general readability improvements

src/Utility/HttpClient.h

@@ -2,7 +2,9 @@
 #define HTTPCLIENT_H
 
 #include <curl/curl.h>
+#include <libxml/parser.h>
 #include <stddef.h>
+#include <time.h>
 
 typedef struct {
   char *memory;
@@ -13,4 +15,18 @@ typedef struct {
 HttpResponse http_get(const char *url, const char *user_agent);
 void http_response_free(HttpResponse *resp);
 
+typedef xmlDocPtr (*XmlParserFn)(const char *data, size_t size,
+                                 const char *url);
+
+typedef struct {
+  char *memory;
+  size_t size;
+  void *parsed_result;
+  int success;
+} CachedHttpResponse;
+
+CachedHttpResponse cached_http_get(const char *url, const char *user_agent,
+                                   const char *cache_key, time_t cache_ttl,
+                                   XmlParserFn parser);
+
 #endif