Http.request with post_data results in bad request (SOLVED)

Questions
1

Hi,

I try to make http.request work. I want to send a post_data with it, but I don’t know the correct format.

local function http_result(self, _, response)
	print(response.status)
	print(response.response)
	pprint(response.headers)
end

function init(self)
	local postdata = "{'val1':22.34}"
	http.request("http://examplepage.org/service","POST",http_result,nil, postdata)
end

results in
{“status”:{“apiCode”:“This value should not be blank.”,“apiMessage”:"([val1])",“httpCode”:400,“httpMessage”:“Bad Request”}}
no matter what I use in “post_data” string. I tried several inputs like “:” instead of “=” and several Brackets []{}. The reference page only refers to “post_data” as a string.
What is the correct format of “post_data” in http.request or am I doing something else wrong?

2

The correct format depends entirely on the service you are communicating with.
Where is the api specification?
Also, it mentions: "“apiCode”:“This value should not be blank.”. COuld that be the error? That you don’t specify the apiCode?

3

Ah thanks, so it’s not a Defold issue, but depends on the url-service.

Maybe someone can still help me how to specify the apiCode.
I try to get infomation from
http://openstreetcam.org/nearby-tracks

If I use for example an online request service (for example: https://www.codepunker.com/tools/http-requests) and send
lat=37.811784337568625&lng=-122.26420640945436&distance=3.125&myTracks=false&filterUserNames=false
I get:
{
“status”: {
“apiCode”: “600”,
“apiMessage”: " The request has been processed without incidents ",
“httpCode”: 200,
“httpMessage”: “Success”
…
Why can I get there a response without any api specification?
PS.: I hope I’m allowed to post external websites

4

You did use an api, by specifying keywords and values in the url. That’s part of the GET

By googling for that website and api, I immediately found the api: http://api.openstreetcam.org/api/doc.html

You can use that with e.g. curl to test your calls outside of Defold first, to test them out.

5

Sorry if it is somewhat confusing. I know my api. In the first post it was “local postdata” variable as an example. It also works outside of Defold. Here is the request with curl:
curl --data “lat=37.811784337568625&lng=-122
.26420640945436&distance=3.125&myTracks=false&filterUserNames=false” http://open
streetcam.org/nearby-tracks
When i put it in the Defold http.request function it does not work.

local function http_result(self, _, response)
	print(response.status)
	print(response.response)
	pprint(response.headers)
end

function init(self)
	http.request("http://openstreetcam.org/nearby-tracks","POST",http_result,nil, "lat=37.811784337568625&lng=-122.26420640945436&distance=3.125&myTracks=false&filterUserNames=false")
end

What am I doing wrong with the http.request function? And again I’m sorry if i missunderstand the main concept of this function.

6

If you run curl with -v for verbose mode you see headers as well:

$ curl -v --data "lat=37.811784337568625&lng=-122.26420640945436&distance=3.125&myTracks=false&filterUserNames=false" http://openstreetcam.org/nearby-tracks
*   Trying 78.47.202.71...
* TCP_NODELAY set
* Connected to openstreetcam.org (78.47.202.71) port 80 (#0)
> POST /nearby-tracks HTTP/1.1
> Host: openstreetcam.org
> User-Agent: curl/7.54.0
> Accept: */*
> Content-Length: 98
> Content-Type: application/x-www-form-urlencoded

You need to pass the same content type header with Defold for the request to work:

local function http_result(self, _, response)
	print(response.status)
	print(response.response)
	pprint(response.headers)
end

local headers = {
	["Content-Type"] = "application/x-www-form-urlencoded"
}
http.request("http://openstreetcam.org/nearby-tracks","POST",http_result,headers, "lat=37.811784337568625&lng=-122.26420640945436&distance=3.125&myTracks=false&filterUserNames=false")
4 Likes
7

Thanks! It works fine now.

2 Likes