HERE RESTful API - POST - Fleet Telematics

Hi, How can I send this request in matlab?

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curl --location --request POST 'https://fleet.cit.api.here.com/2/calculateroute.json?routeMatch=1&mode=car&app_id=ABCDEFGHIJK&app_code=ABCDEFGHIJK&attributes=ROAD_GEOM_FCn(*),%0ASPEED_LIMITS_FCn(*)' \

--header 'Content-Type: text/plain' \

--data-raw '<?xml version="1.0" encoding="UTF-8" standalone="no"?><gpx version="1.0" creator="ITN Converter 1.94M (http://www.benichou-software.com)" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.topografix.com/GPX/1/0" xmlns:topografix="http://www.topografix.com/GPX/Private/TopoGrafix/0/2" xsi:schemaLocation="http://www.topografix.com/GPX/1/0 http://www.topografix.com/GPX/1/0/gpx.xsd http://www.topografix.com/GPX/Private/TopoGrafix/0/2 http://www.topografix.com/GPX/Private/TopoGrafix/0/2/topografix.xsd"><time>2020-06-22T11:22:23Z</time><bounds minlat="49.274710" minlon="9.223330" maxlat="49.288730" maxlon="9.242580"/><rte><name>Route_from_Peter</name><rtept lat="49.274710" lon="9.223330"/><rtept lat="49.274740" lon="9.223380"/><rtept lat="49.274840" lon="9.223540"/><rtept lat="49.275030" lon="9.223830"/><rtept lat="49.275160" lon="9.224100"/><rtept lat="49.275260" lon="9.224290"/>...........................<rtept lat="49.288230" lon="9.241680"/><rtept lat="49.288280" lon="9.241760"/><rtept lat="49.288340" lon="9.241850"/><rtept lat="49.288390" lon="9.241920"/><rtept lat="49.288440" lon="9.241990"/><rtept lat="49.288560" lon="9.242200"/><rtept lat="49.288730" lon="9.242580"/></rte></gpx>'

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I have used this code,

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url = 'https://fleet.cit.api.here.com/2/calculateroute.json?routeMatch=1&mode=car&app_id=ABCDEFGHIJK&app_code=ABCDEFGHIJK &attributes=ROAD_GEOM_FCn(*),SPEED_LIMITS_FCn(*)';

weboptions('ContentType','text','RequestMethod','POST')

payload = fileread('AudiRoute_Section01.gpx');

response = webwrite(url,payload);

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The response was,

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Error using matlab.internal.webservices.HTTPConnector/copyContentToByteArray (line 396)

The server returned the status 400 with message "" in response to the request to URL

https://fleet.cit.api.here.com/2/calculateroute.json?routeMatch=1&mode=car&app_id=ABCDEFGHIJK&app_code=ABCDEFGHIJK&attributes=ROAD_GEOM_FCn%28%2A%29,SPEED_LIMITS_FCn%28%2A%29,ADAS_ATTRIB_FCn%28%2A%29,LINK_ATTRIBUTE_FCn%28%2A%29.

Error in readContentFromWebService (line 46)

byteArray = copyContentToByteArray(connection);

Error in webwrite (line 139)

[varargout{1:nargout}] = readContentFromWebService(connection, options);

Error in rest (line 4)

response = webwrite(url,payload);

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Can anyone help here?

Thanks in Advance.

Answer 1

[Geoff Hayes]

Sridhar - the 400 error code indicates (if I recall correctly) that there is a problem with your request. I see that you call

weboptions('ContentType','text','RequestMethod','POST')

but that you don't do anything with the result of that call. I think that your code could be more like

url = 'https://fleet.cit.api.here.com/2/calculateroute.json?routeMatch=1&mode=car&app_id=ABCDEFGHIJK&app_code=ABCDEFGHIJK &attributes=ROAD_GEOM_FCn(*),SPEED_LIMITS_FCn(*)';
options = weboptions('ContentType','text','RequestMethod','POST');
payload = fileread('AudiRoute_Section01.gpx');
response = webwrite(url,payload,options); % <--- include the options as a parameter of webwrite

I can't test the above so I don't know if it will work (especially with the payload) but it might get you a little further.

[Sridhar Eswaran]

Hi Geoff,

Thank you for your input. I tried your suggesstion, but I am stil getting the error.

Error using matlab.internal.webservices.HTTPConnector/copyContentToByteArray (line 396)
The server returned the status 400 with message "" in response to the request to URL
https://fleet.cit.api.here.com/2/calculateroute.json?routeMatch=1&mode=car&app_id=ABCDEFGHIJK&app_code=ABCDEFGHIJK&attributes=ROAD_GEOM_FCn%28%2A%29,SPEED_LIMITS_FCn%28%2A%29.

Error in readContentFromWebService (line 46)
        byteArray = copyContentToByteArray(connection);

Error in webwrite (line 139)
    [varargout{1:nargout}] = readContentFromWebService(connection, options);

Error in Untitled (line 5)
response = webwrite(url,payload,options);

[Geoff Hayes]

Sridhar - does the AudiRoute_Section01.gpx payload match the xml that you pass via --data-raw?

[Sridhar Eswaran]

Geoff, It does. So far I have been using 'POSTMAN' application to send this requests and save the response as JSON and post-process it in MATLAB. I have copy, pasted the same cURL code generated by the application in the question.

[Geoff Hayes]

You could confirm if the payload variable looks to be as expected (i.e. an xml string). Otherwise, I'm not sure what is incorrect - the 400 error still suggests a problem with the request.

Alternatively, you can (probably) call the curl from within MATLAB using the system command like

command = 'curl --location --request POST ''https://fleet.cit.api.here.com/2/calculateroute.json?routeMatch=1&mode=car&app_id=ABCDEFGHIJK&app_code=ABCDEFGHIJK&attributes=ROAD_GEOM_FCn(*),%0ASPEED_LIMITS_FCn(*)''';
command = [command ' --header ''Content-Type: text/plain'''];
command = [command ' --data-raw ''<?xml version="1.0" encoding="UTF-8" standalone="no"?><gpx version="1.0" creator="ITN Converter 1.94M (http://www.benichou-software.com)" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.topografix.com/GPX/1/0" xmlns:topografix="http://www.topografix.com/GPX/Private/TopoGrafix/0/2" xsi:schemaLocation="http://www.topografix.com/GPX/1/0 http://www.topografix.com/GPX/1/0/gpx.xsd http://www.topografix.com/GPX/Private/TopoGrafix/0/2 http://www.topografix.com/GPX/Private/TopoGrafix/0/2/topografix.xsd"><time>2020-06-22T11:22:23Z</time><bounds minlat="49.274710" minlon="9.223330" maxlat="49.288730" maxlon="9.242580"/><rte><name>Route_from_Peter</name><rtept lat="49.274710" lon="9.223330"/><rtept lat="49.274740" lon="9.223380"/><rtept lat="49.274840" lon="9.223540"/><rtept lat="49.275030" lon="9.223830"/><rtept lat="49.275160" lon="9.224100"/><rtept lat="49.275260" lon="9.224290"/>...........................<rtept lat="49.288230" lon="9.241680"/><rtept lat="49.288280" lon="9.241760"/><rtept lat="49.288340" lon="9.241850"/><rtept lat="49.288390" lon="9.241920"/><rtept lat="49.288440" lon="9.241990"/><rtept lat="49.288560" lon="9.242200"/><rtept lat="49.288730" lon="9.242580"/></rte></gpx>'''];

[status, output] = system(command);

assuming that the correct app_id and and app_code are used.

[Sridhar Eswaran]

Hi Geoff,

I tried the method you suggested. Still getting error same error. May be I am doing something wrong here. Lemme try again and get back to you. Please suggest if you have any other methods.

Really appreciate your help. Thanks.

[Geoff Hayes]

Hi Sridhar - I tried with the above code using system and it worked so long a valid app code and id were used.

[Sridhar Eswaran]

Hi Geoff, I will reacquire a new app id, app code and try your suggestion. Will let you know the outcome. Thanks