Can the lws server handle encoded request with chunk

[KehYiQian]

Hi,

Can the server handle the request that encoding with "Transfer-Encoding: chunked" ? For the example I just build the server using lws and I test the server using the curl as the client, then is it can handle the command like

echo '{"hello":"world"}' > body.json
curl --http1.1 -k -H "Transfer-Encoding: chunked" -H "Content-Type: application/json" -H "Authorization: Basic bXl1c2VyOm15cGFzc3dvcmQ=" --data-binary @body.json https://127.0.0.1:7682/api/time

If yes, can simply summarize how to handle? Thank you.

[lws-team]

For client, lws accepts Transfer-encoding from the server, and understands the headers. You will get a callback LWS_CALLBACK_RECEIVE_CLIENT_HTTP indicating something came, you must call lws_http_client_read() there to get one or more callbacks at LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ with dechunked but possibly fragmented data. In the way for client, chunked is always acceptable from the server and its existence is concealed to the user code, which only sees fragmented body data.

For server, it's your problem if you want to observe the client's request about the Transfer-encoding. You must manually add the http header to the server's response, and manually add the chunking headers inline in the response. lws does this for, eg, cgi responses so it can avoid long delays with unsent stdout fragments.

[KehYiQian]

Thank you for the quick response. The main point that I want to ask is if the request is chunked then the request's body may sent with the hex-size look like 12\r\n {"hello":"world"}\r\n 0\r\n\r\n to the server but I just wanna to catch the {"hello":"world"}, is the lws can handle it or I need to handle it manually? if yes, can you simply summarize how to handle it? thanks

Btw one more question, is the lws has any APIs that can let the server side know what the http version e.g. http1.1/http2 is received from the client's request?

[lws-team]

For client, lws will take care of chunked and conceal the hex headers. For server, if you want to send a header, and a body with hex headers, you need to actually append the header and the body with hex headers in your code.

You can tell it from the presence of mandatory h2 :headers or not.

[KehYiQian]

Thank you first for willing to answer me. So assume if the server receive the request's body like 12\r\n {"hello":"world"}\r\n 0\r\n\r\n
( based on the command like - curl --http1.1 -k -H "Transfer-Encoding: chunked" -H "Content-Type: application/json" -H "Authorization: Basic bXl1c2VyOm15cGFzc3dvcmQ=" --data-binary @body.json https://127.0.0.1:7682/api/time) ,
is it can retrieve just the {"hello":"world"} or not via the lws owns APIs or callbacks or otherwise? Or is just retrieve both 12\r\n {"hello":"world"}\r\n 0\r\n\r\n