Ok, I did dive into the issue and found the bug which is on the server side:
the server does bug if you send mix-cased http header names, namely
'Content-type'
instead of 'Content-Type'.
Weird, I have a very strong feeling of deja vu.
Here is a patch to work-around those buggy servers with lynx:
---
--- a/WWW/Library/Implementation/HTTP.c
+++ b/WWW/Library/Implementation/HTTP.c
@@ -1741,13 +1741,13 @@
anAnchor->post_content_type
? anAnchor->post_content_type
: "lose"));
- HTBprintf(&command, "Content-type: %s%c%c",
+ HTBprintf(&command, "Content-Type: %s%c%c",
anAnchor->post_content_type
? anAnchor->post_content_type
: "lose",
CR, LF);
- HTBprintf(&command, "Content-length: %d%c%c",
+ HTBprintf(&command, "Content-Length: %d%c%c",
!isBEmpty(anAnchor->post_data)
? BStrLen(anAnchor->post_data)
: 0,