From 1774dbd74c77cd6c728588c8a717903dd16003f3 Mon Sep 17 00:00:00 2001
From: Emil Engler <me@emilengler.com>
Date: Tue, 21 Jan 2020 09:23:21 +0100
Subject: curl: Let -D merge headers in one file again

Closes #4762
Fixes #4753
---
 src/tool_operate.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/tool_operate.c b/src/tool_operate.c
index 66f2139c8..2e6563a20 100644
--- a/src/tool_operate.c
+++ b/src/tool_operate.c
@@ -871,7 +871,8 @@ static CURLcode single_transfer(struct GlobalConfig *global,
         if(config->headerfile) {
           /* open file for output: */
           if(strcmp(config->headerfile, "-")) {
-            FILE *newfile = fopen(config->headerfile, "wb");
+            FILE *newfile;
+            newfile = fopen(config->headerfile, per->prev == NULL?"wb":"ab");
             if(!newfile) {
               warnf(config->global, "Failed to open %s\n", config->headerfile);
               result = CURLE_WRITE_ERROR;
-- 
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