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I'm currently trying to build an Arduino robot controlled via a wifi connection. I have an Arduino Mega running as a client and it successfully connects to the server on LAN via the Adafruit cc3000 wifi board. However instead of grabbing the contents of the JSON file and printing it to serial, I'm just getting a 100 continue response. While this means I'm doing something right, I don't know what to do next in order to grab the data I need. Do I need to get the 100 message then respond with the GET request, or is there a way that I can GET the data straight away?
Thank you all in advance. Here is the Arduino code I have so far:
The initial JSON file I'm using contains the following:
And the serial output I get when I run the Sketch:
ad infinitum
3 Answers
you are missing the HOST header in the request, so the server tell you to 100 CONTINUE you request.Also yes, the final empty row IS mandatory
for example, to ask www.example.com/index.html
I'm going to guess that it's a problem with your server not expecting an HTTP/1.0 request. I note the following from RFC 1945 about the response codes:
9.1 Informational 1xx
This class of status code indicates a provisional response, consisting only of the Status-Line and optional headers, and is terminated by an empty line. HTTP/1.0 does not define any 1xx status codes and they are not a valid response to a HTTP/1.0 request. However, they may be useful for experimental applications which are outside the scope of this specification.
Mac Os Tcp Client For Arduino Uno
I'd recommend changing your request to be HTTP/1.1 compliant (with a Host: header as suggested by @lesto)
Okay, I have a better answer, again done without testing.
If I look at the BNF for an HTTP-message from the RFC, it indicates that the message body is terminated by a blank line.
So, you actually need 2 CRLFs (i.e. 2 blank lines). The first one separates the headers from the body of the HTTP request. You don't actually have a message body (which is fine, it is optional). But, you'll need another CRLF to terminate the (blank) body.
Since you only sent one blank line, the server is sending you the continue status codes, prompting you to finish sending your message (i.e. the message body).
Arduino Drivers For Mac
So, try adding another client.println(');