Add headers example

examples/headers/.gitignore

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+*.o
+.objs
+headers.so
+assets.h
+cert

examples/headers/README.md

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+Example on how to read HTTP request headers and set your own custom ones.
+
+Run:
+```
+	# kore run
+```
+
+Test:
+```
+	# curl -H "X-Custom-Header: testing" -i -k https://127.0.0.1:8888
+```
+
+If X-Custom-Header is given, it will be mirrored in the response.

examples/headers/conf/headers.conf

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+# Placeholder configuration
+
+bind		127.0.0.1 8888
+pidfile		kore.pid
+ssl_no_compression
+load		./headers.so
+
+domain 127.0.0.1 {
+	certfile	cert/server.crt
+	certkey		cert/server.key
+	static	/	page
+}

examples/headers/src/headers.c

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+#include <kore/kore.h>
+#include <kore/http.h>
+
+int		page(struct http_request *);
+
+int
+page(struct http_request *req)
+{
+	char		*custom;
+
+	/*
+	 * We'll lookup if the X-Custom-Header is given in the request.
+	 * If it is we'll set it as a response header as well.
+	 *
+	 * The value returned by http_request_header_get() must be freed.
+	 *
+	 * NOTE: All custom headers you set must be in lower case due to
+	 * the SPDYv3 specification requiring this.
+	 */
+	if (http_request_header_get(req, "x-custom-header", &custom)) {
+		http_response_header_add(req, "x-custom-header", custom);
+		kore_mem_free(custom);
+	}
+
+	/* Return 200 with "ok\n" to the client. */
+	http_response(req, 200, "ok\n", 3);
+
+	return (KORE_RESULT_OK);
+}