Rewrite

examples/server/020_response_undo.c

@@ -0,0 +1,55 @@
+#include <http.h>
+
+// This example shows how undo a response that is being built
+// when an error occurs.
+
+int main(void)
+{
+    HTTP_Server *server = http_server_init(HTTP_STR("127.0.0.1"), 8080);
+    if (server == NULL)
+        return -1;
+
+    for (;;) {
+
+        HTTP_Request *req;
+        HTTP_ResponseHandle res;
+
+        int ret = http_server_wait(server, &res, &res);
+        if (ret < 0) return -1;
+
+        // Say we are building a request..
+
+        http_response_status(res, 200);
+        http_response_header(res, "Content-Type: text/plain");
+
+        // .. and in the middle of building an error condition
+        // occurs. Maybe a file was missing or an allocation fails.
+        // The proper response in this case would be a code 500
+        // with an error message, but we already wrote the first
+        // part of the response assuming the operation would succede.
+        //
+        // You can use the *_undo function to reset the response
+        // building process
+
+        bool error_occurred = true;
+        if (error_occurred) {
+
+            http_response_undo(res);
+
+            // Now we are back to setting the status code
+            http_response_status(res, 500);
+            http_response_header(res, "Content-Type: text/plain");
+            http_response_body(res, HTTP_STR("An error occurred!"));
+            http_response_done(res);
+
+        } else {
+
+            // If no error occures, we finish as planned
+            http_response_body(res, HTTP_STR("Hello, world!"));
+            http_response_done(res);
+        }
+    }
+
+    http_server_free(server);
+    return 0;
+}