Squashed commits included:
Bug fixes and final implementation
- Added Content-Length: 0 to all headers
- Endpoint name checks not using trailing space so cache-busting techniques can be used (i.e., append a nonce to the URL)
- Track when connecting so APList scan doesn't take place during (which changes the channel)
- More debugging output added to assist in tracking down some issues
Added /status.json endpoint for phone apps/XHR to get JSON response
Station Status caching for wifi channel workaround + AJAX/CORS
- During checkstation poll, cache the last station status
- Shut down the station if status = 2,3,4 and channel is different than SoftAP
- Add Access-Control-Allow-Origin: * to endpoint responses used by a service
- Add a /setwifi GET endpoint for phone apps/XHR to use (same parameters as /update endpoint). Returns a JSON response containing chip id and status code.
- Add handler for OPTIONS verb (needed for CORS support)
Wi-Fi Channel Issue Workaround
- Do a site survey upon startup, set SoftAP channel to the strongest rssi's channel
- Compare successful station connect channel to SoftAP's. If different, then defer the Lua success callback to the end. Shut down Station and start the SoftAP back up with original channel.
- After the 10 second shutdown timer fires, check to see if success callback was already called. If not, then call it while starting the Station back up.
HTTP Response and DNS enhancements
- If DNS's UDP buffer fills up, keep going as non-fatal. It's UDP and not guaranteed anyways. I've seen this occur when connecting a PC to the SoftAP and every open program tries to phone home at the same time, overwhelming the EUS DNS server.
- Support for detecting/handling pre-gzipped `enduser_setup.html` (and `http_html_backup`) payload. Nice for keeping the size of the `state->http_payload_data` as small as possible (also makes minimization not as critical)
- Corrected misuse of HTTP 401 response status (changed one occurrence to 400/Bad Request, and changed another to 405/Method Not Allowed)
* Normalized formatting (tabs-to-spaces)
* Added documentation
* Corrected misuse of strlen for binary (gzip) data.
* Added NULL check after malloc
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