--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/seobeo/tests/seobeo_response_test.c	Sun Aug 02 16:50:48 2026 -0700
@@ -0,0 +1,79 @@
+#include "seobeo/seobeo.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+
+int main(void)
+{
+  int sockets[2];
+  if (socketpair(AF_UNIX, SOCK_STREAM, 0, sockets) != 0)
+    return 1;
+
+  Seobeo_Handle handle = {0};
+  handle.socket = sockets[0];
+  handle.write_buffer_capacity = 4096;
+  handle.write_buffer = malloc(handle.write_buffer_capacity);
+
+  Dowa_Arena *arena = Dowa_Arena_Create(4096);
+  Seobeo_Request_Entry *response = NULL;
+  Dowa_HashMap_Push_Arena(response, "status", "200", arena);
+  Dowa_HashMap_Push_Arena(response, "content-type", "text/plain", arena);
+  Dowa_HashMap_Push_Arena(response, "body", "hello", arena);
+  Dowa_HashMap_Push_Arena(response, "X-Test", "present", arena);
+  Dowa_HashMap_Push_Arena(response, "X-Unsafe", "bad\r\nInjected: yes", arena);
+
+  Seobeo_Router_Send_Response(&handle, response, arena);
+
+  char received[4096] = {0};
+  ssize_t length = read(sockets[1], received, sizeof(received) - 1);
+  int failed = 0;
+  if (length <= 0)
+    failed = 1;
+  if (!strstr(received, "Content-Length: 5\r\n"))
+    failed = 1;
+  if (!strstr(received, "X-Test: present\r\n\r\nhello"))
+    failed = 1;
+  if (strstr(received, "Injected: yes"))
+    failed = 1;
+
+  if (failed)
+    fprintf(stderr, "Unexpected response:\n%s\n", received);
+
+  close(sockets[0]);
+  close(sockets[1]);
+  free(handle.write_buffer);
+  Dowa_Arena_Free(arena);
+
+  if (socketpair(AF_UNIX, SOCK_STREAM, 0, sockets) != 0)
+    return 1;
+
+  memset(&handle, 0, sizeof(handle));
+  handle.socket = sockets[0];
+  handle.write_buffer_capacity = 4096;
+  handle.write_buffer = malloc(handle.write_buffer_capacity);
+  arena = Dowa_Arena_Create(4096);
+  response = NULL;
+  Dowa_HashMap_Push_Arena(response, "status", "204", arena);
+  Dowa_HashMap_Push_Arena(response, "content-type", "text/plain", arena);
+  Dowa_HashMap_Push_Arena(response, "body", "", arena);
+  Seobeo_Router_Send_Response(&handle, response, arena);
+
+  memset(received, 0, sizeof(received));
+  length = read(sockets[1], received, sizeof(received) - 1);
+  if (length <= 0 ||
+      !strstr(received, "HTTP/1.1 204 No Content\r\n") ||
+      !strstr(received, "Content-Length: 0\r\n") ||
+      !strstr(received, "\r\n\r\n"))
+    failed = 1;
+
+  if (failed)
+    fprintf(stderr, "Unexpected no-content response:\n%s\n", received);
+
+  close(sockets[0]);
+  close(sockets[1]);
+  free(handle.write_buffer);
+  Dowa_Arena_Free(arena);
+  return failed;
+}