HERE RESTful API - POST - Fleet Telematics

Question

Sridhar Eswaran 2020-6-24

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评论： Sridhar Eswaran 2020-6-29

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>'

/////

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);

////

The response was,

////

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);

///

Can anyone help here?

Thanks in Advance.

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Answer 1

Geoff Hayes 2020-6-24

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https://ww2.mathworks.cn/matlabcentral/answers/553921-here-restful-api-post-fleet-telematics#answer_456556

在 MATLAB Online 中打开

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.

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Geoff Hayes 2020-6-25

在 MATLAB Online 中打开

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.

Geoff Hayes 2020-6-26

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 2020-6-29

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

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