HTTPTest app beta release

I have written a small HTTPTest app which allows you to send and receive HTTP/HTTPS requests. I guess it is mostly interesting for developers but may also be usefull for controlling smart home devices if they have a http api. It uses the HTTPLib from Chris Mahoney and is basically a frontend for it.

Main features are:
– Send and receive HTTP/HTTPS requests
– Support for several http verbs: GET, POST, PUT, DELETE
– Ability to add headers to the request
– Shows the status code received
– Allows you to save the response

It is still beta because there is a zero pain error when sending a request but I can’t find the error in my code. Since this is my first app written in C any help is welcome.

You can download it from here – sources (DDE) are included.

Looks handy :-)

In get_response_status (c.request), you are returning a pointer to a value that’s on the stack¹.
I think you get away with it here because the call

 displayfield_set_value(0, main_window_object, STATUS_TEXT_DISPLAY, get_response_status(status));

to OSLib doesn’t use your user mode stack in fact, so the response string isn’t overwritten before
Toolbox gets to save it.

However, if you want to be safer, and perhaps simpler, you could go

static char * get_response_status(int code){
  for(int i = 0; i < arraysize; i++){
    if(code == response_map[i].code)
      return response_map[i].response;
  }

  return "Unknown response code.";
}

As for your ZeroPain, that’s caused by httplib. The ZeroPain happens if you have
a header or body, but not both or neither (too many double negatives).

The reason is that when you call

void start_request(const char *url, HTTPCompletedCallback cb, int method, int datawanted, const char *headers, const char *body)

it goes

 if (headers == NULL && body == NULL)
  {
    ...
  }
  else
  {
    char *values = malloc(strlen(headers) + strlen(sep) + strlen(body) + 1);
    ...
  }

Notice that in the else clause either of headers or body can be NULL, but strlen is called on both of them, and so a read of the zeroth page doth follow.

I hope that helps.

¹ The first line allocates 65 bytes on the stack and then copies the string literal there from your read-only data.

Thanks for looking at the code. I will have a look at get_response_status and change it the way you suggested.

Regarding the HTTPLib – I could change it in my copy but the library is from Chris Mahoney – so it would be better if he makes the change since the library might be used in other applications, too. Unfortunately I don’t have the e-mail address of Chris so I hope he will read your post here.

The ZeroPain happens if you have a header or body, but not both or neither.

I’ll take a look when I get a chance (although I’m a bit busy this week). I think I did a bit of a rush job with getting header support in there, so now I get to do it properly :)

Thanks for tracking it down!

Because I’m a glutton for punishment, I’ve quick-fixed it again. Does this one work?

As for the app itself, I have it a quick go. Neat! It’s like a mini version of Insomnia.

Thanks Chris, I have uploaded a new version including your bug fix. I did not see a zero pain error anymore with this version. I also included the change Julie suggested – it is much better this way.

This was my first attempt to get into C programming and I got a lot of help and support from Jean-Michel Bruck (thanks!). But I wanted a small app to test REST webservices. Since I use REST a lot at work and there are a lot of interesting REST services out there my idea was to find out how to use them from RISC OS.

Where do I get the Toolbox.Tabs module from?

Where do I get the Toolbox.Tabs module from?

0.12 seems the latest.

http://www.riscpkg.org/arm/Tabs/Tabs_0.12 or PackMan