4 files changed, 18 insertions, 2 deletions

diff --git a/src/lib/mhd_limits.h b/src/lib/mhd_limits.h
index 1b0f5d7d..41d33a8f 100644
--- a/src/lib/mhd_limits.h
+++ b/src/lib/mhd_limits.h
@@ -143,4 +143,12 @@
 #endif /* _WIN32 */
 #endif /* !TIMEVAL_TV_SEC_MAX */
 
+#ifndef MHD_FD_BLOCK_SIZE
+#ifdef _WIN32
+#define MHD_FD_BLOCK_SIZE 16384 /* 16k */
+#else /* _WIN32 */
+#define MHD_FD_BLOCK_SIZE 4096 /* 4k */
+#endif /* _WIN32 */
+#endif /* !MHD_FD_BLOCK_SIZE */
+
 #endif /* MHD_LIMITS_H */
diff --git a/src/lib/response_from_fd.c b/src/lib/response_from_fd.c
index cdeb7aa5..6eac3f7f 100644
--- a/src/lib/response_from_fd.c
+++ b/src/lib/response_from_fd.c
@@ -182,7 +182,7 @@ MHD_response_from_fd (enum MHD_HTTP_StatusCode sc,
 
   response = MHD_response_from_callback (sc,
                                          size,
-                                         4 * 1024,
+                                         MHD_FD_BLOCK_SIZE,
                                          &file_reader,
                                          NULL,
                                          &free_callback);
diff --git a/src/microhttpd/mhd_limits.h b/src/microhttpd/mhd_limits.h
index 1b0f5d7d..41d33a8f 100644
--- a/src/microhttpd/mhd_limits.h
+++ b/src/microhttpd/mhd_limits.h
@@ -143,4 +143,12 @@
 #endif /* _WIN32 */
 #endif /* !TIMEVAL_TV_SEC_MAX */
 
+#ifndef MHD_FD_BLOCK_SIZE
+#ifdef _WIN32
+#define MHD_FD_BLOCK_SIZE 16384 /* 16k */
+#else /* _WIN32 */
+#define MHD_FD_BLOCK_SIZE 4096 /* 4k */
+#endif /* _WIN32 */
+#endif /* !MHD_FD_BLOCK_SIZE */
+
 #endif /* MHD_LIMITS_H */
diff --git a/src/microhttpd/response.c b/src/microhttpd/response.c
index 21e23a8a..29edef4f 100644
--- a/src/microhttpd/response.c
+++ b/src/microhttpd/response.c
@@ -566,7 +566,7 @@ MHD_create_response_from_fd_at_offset64 (uint64_t size,
     return NULL;
 
   response = MHD_create_response_from_callback (size,
-                                                4 * 1024,
+                                                MHD_FD_BLOCK_SIZE,
                                                 &file_reader,
                                                 NULL,
                                                 &free_callback);