LibCore: Move HTTP classes from LibGUI to LibCore.

LibCore/CHttpJob.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include <LibCore/CNetworkJob.h>
+#include <LibCore/CHttpRequest.h>
+#include <AK/HashMap.h>
+
+class CTCPSocket;
+
+class CHttpJob final : public CNetworkJob {
+public:
+    explicit CHttpJob(const CHttpRequest&);
+    virtual ~CHttpJob() override;
+
+    virtual void start() override;
+
+    virtual const char* class_name() const override { return "CHttpJob"; }
+
+private:
+    void on_socket_connected();
+
+    enum class State {
+        InStatus,
+        InHeaders,
+        InBody,
+        Finished,
+    };
+
+    CHttpRequest m_request;
+    CTCPSocket* m_socket { nullptr };
+    State m_state { State::InStatus };
+    int m_code { -1 };
+    HashMap<String, String> m_headers;
+};