In case the actual request-body is empty it seems not Content-Type
header is set by browsers.

Tested on a vm with stopping and starting a container via GUI
(/api2/extjs/nodes/<nodename>/lxc/<vmid>/status/stop)

fixes f398a3d94bb5c798e1e1ea91113cd76648dd79eb

Reported-by: Friedrich Weber <f.we...@proxmox.com>
Reported-by: Fiona Ebner <f.eb...@proxmox.com>
Signed-off-by: Stoiko Ivanov <s.iva...@proxmox.com>
---
 src/PVE/APIServer/AnyEvent.pm | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/PVE/APIServer/AnyEvent.pm b/src/PVE/APIServer/AnyEvent.pm
index 6831a86..1fd7a74 100644
--- a/src/PVE/APIServer/AnyEvent.pm
+++ b/src/PVE/APIServer/AnyEvent.pm
@@ -745,7 +745,8 @@ sub proxy_request {
        my $content;
 
        if  ($method eq 'POST' || $method eq 'PUT') {
-           if ($reqstate->{request}->header('Content-Type') =~ 
'application/json') {
+           my $request_ct = $reqstate->{request}->header('Content-Type');
+           if (defined($request_ct) && $request_ct =~ 'application/json') {
                $headers->{'Content-Type'} = 'application/json';
                $content = encode_json($params);
            } else {
-- 
2.30.2



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