Re: [lwip-users] httpd: how to redirect to a new address

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On 19.02.2018 23:18, Jan Menzel wrote:
> Hi all!
>         In our application we wont to allow the user to change the ip address
> of the server using a webpage. I wonder what would be the best way of
> doing that.
>         At present we use a very basic webserver that servers a different page
> (with HTTP status code 301) if the parameters update the ip address.
> After sending out the last byte we change the ip address, so the server
> is immediately listening on the new address.

That's not really correct. The tcp connection lasts at least a little 
longer as the http server knows. I think you'll get some kind of tcp 
connection errors when doing it that way. It might work, but it's better 
to wait a little longer and implement a delay in the browser, as 
Giuseppe already mentioned.

>         With lwip we can either use LWIP_HTTPD_CGI_SSI with a single parameter
> handler but how to server different status codes? And, when is the
> correct time of changing the ip address? Or we could use LWIP_HTTPD_CGI
> which read kind of deprecated in the documentation.
>         Is there a recommended procedure how lwip can server is purpose?

Changing the headers (or adding header fields) is currently not 
supported. This is something on the list (at least a minimum support to 
enable user login sessions), but it's not there, yet.

However, you can implement this by using custom files. When the returned 
file has FS_FILE_FLAGS_HEADER_INCLUDED set in its flags, httpd assumes 
file->data includes both the file data *and* all http headers. You are 
then free to send all headers you whish.

This can be combined with any CGI or SSI support.

Simon

>         Jan
>
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