Yes - the web services can output a lot of different formats. Just specify the 'format' parameter (see documentation). If you use PHP, you can evaluate the feed directly (with the eval method of PHP) - same thing in Python. Some sample code are available on the client libraries page In javascript, you have a Javascript library and a leaflet plugin

What are the HTTP status codes returned ?

Here are the HTTP status codes that web services can return

• 401 : Need auth. The API key parameter is missing, wrong, or doesn't correspond to any subscriptions
• 403 : Unhauthorized (auth will change nothing). Your IP is not allowed.
• 429 : Too many requests. You exceeded the authorized rate
• 412 : Missing parameter. Some parameters required for the web services are missing, please consult the documentation
• Others : standard code (404: page not found, 500 : internal error)

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When I call the web services, I get 'error null'. What does it mean ?

The billing server is probably down. Please contact the administrator.

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Is it possible to call the web service with HTTP instead of HTTPS ?

If you call using HTTP, your request will be automatically redirected to HTTPS.

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What encoding do you use ?

The parameters have to be URL encoded.

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What HTTP method is supported ?

Only GET is allowed. OPTION and HEAD are also accepted, but POST is not.

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What about the same-origin security policy / CORS ?

Same-origin-policy : some browsers or software doesn't allow you to make Ajax calls to a different server than the current page one. If you have some problems, use a kind of proxy on your server, that will make calls and send them back to the browser.
We have some CORS or Cross-origin_resource_sharing but don't give warranty on that.

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Is there some client libraries I can use ?

Some client libs exist. You can find some information on the client libraries page