Add libhv and test http client

vendor/libhv/include/hv/hmap.h

@@ -0,0 +1,55 @@
+#ifndef HV_MAP_H_
+#define HV_MAP_H_
+
+#include "hconfig.h"
+
+#include <map>
+#include <string>
+
+// MultiMap
+namespace std {
+/*
+int main() {
+    std::MultiMap<std::string, std::string> kvs;
+    kvs["name"] = "hw";
+    kvs["filename"] = "1.jpg";
+    kvs["filename"] = "2.jpg";
+    //kvs.insert(std::pair<std::string,std::string>("name", "hw"));
+    //kvs.insert(std::pair<std::string,std::string>("filename", "1.jpg"));
+    //kvs.insert(std::pair<std::string,std::string>("filename", "2.jpg"));
+    for (auto& pair : kvs) {
+        printf("%s:%s\n", pair.first.c_str(), pair.second.c_str());
+    }
+    auto iter = kvs.find("filename");
+    if (iter != kvs.end()) {
+        for (int i = 0; i < kvs.count("filename"); ++i, ++iter) {
+            printf("%s:%s\n", iter->first.c_str(), iter->second.c_str());
+        }
+    }
+    return 0;
+}
+ */
+template<typename Key,typename Value>
+class MultiMap : public multimap<Key, Value> {
+public:
+    Value& operator[](Key key) {
+        auto iter = this->insert(std::pair<Key,Value>(key,Value()));
+        return (*iter).second;
+    }
+};
+}
+
+#ifdef USE_MULTIMAP
+#define HV_MAP      std::MultiMap
+#else
+#define HV_MAP      std::map
+#endif
+
+// KeyValue
+namespace hv {
+typedef std::map<std::string, std::string>      keyval_t;
+typedef std::MultiMap<std::string, std::string> multi_keyval_t;
+typedef HV_MAP<std::string, std::string>        KeyValue;
+}
+
+#endif // HV_MAP_H_