[lwip-users] http_client.c: add custom header at run-time

[Giuseppe Modugno]

I'm trying to implement a dynamic DNS client with lwip. The update 
protocol[1] is very simple: it's HTTP based, so I thought to use 
http_client.c that comes with lwip project.

Unfortunately this protocol needs the header "Authorization" in the 
request. It seems http_client.c doesn't support additional headers from 
"User-Agent" (customizable through macro), "Accept: */*", "Host" 
(generated at run-time) and "Connection: Close".

What do you suggest to add the "Authorization" header in the request? 
Note that this header isn't static, because it depends on username and 
password (it must be calculated at run-time).

In my application I will use http_client.c for other connections where 
"Authorization" header shouldn't be present. So this header should be 
added or not at run-time for each connection.

[1] https://www.noip.com/integrate/request