Web APIs

jasmins over 7 years ago

We have used StartProcess() function in WEBAPI with Http method "POST", when we are testing it is giving response properly ,but if we are trying to call through expression rule using httpquery function ,it is throwing "HTTP/1.1 401 Unauthorized" error,
So we have created third party credentials after these setting also we are getting error "HTTP/1.1 404 Not Found".
Please help us to know the error or we are missing any configurations.

Please find below code snippet.
with(
a!startProcess(
processModel: cons!TEST_WEBAPI_PM,
processParameters: a!fromJson(
http!request.body
),
onSuccess: a!httpResponse(
statusCode: 200,
headers: {
a!httpHeader(name: "Content-Type", value: "application/json")
},
body: a!toJson(
fv!processInfo
)
),
onError: a!httpResponse(
statusCode: 500,
headers: {
a!httpHeader(name: "Content-Type", value: "application/json")...

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0 jasmins over 7 years ago

...
},
body: a!toJson(
{
error: "There was an error starting the process"
}
)
)
)
)

Calling URL of these web api in below code

a!httpQuery(
url:"dummy/.../TEST_WEBAPI_PM",
basicAuthenticationCredentials :a!httpAuthenticationBasic(
username :a!scsField(
externalSystemKey :"test",
fieldKey :"username",
usePerUser :false()
),
password :a!scsField(
externalSystemKey :"test",
fieldKey :"password",
usePerUser :false()
),
preemptive :true()
)
)
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0 Sachin
A Score Level 1
over 7 years ago

@jasmins
Hi

Can you please check if the user account , with whom you have registered your third-party credentials has proper required rights/ privilages for the web api / data he is accessing or not

Thanks
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0 jasmins over 7 years ago

for time being ,I have configured my own credentials and also to process model ,web api rule everywhere I have given security. But to access within appian ,we need third-party credentials configurations?
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0 sowjanyav430 over 7 years ago

@jasmins..
Yes,We need third party credentials even within Appian.
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+1 chetany
A Score Level 1
over 7 years ago

httpQuery() does not support the POST method. You can however use a smart service HTTP Query Smart service which supports the POST method. That way you can test your web api through process model.
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0 chetany
A Score Level 1
over 7 years ago

Check this link - forum.appian.com/.../Connector_Functions.html . You can see that the "method" parameter does not support "POST"
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0 chetany
A Score Level 1
over 7 years ago

Yet another option to test your web api is to use the a!httpWrite() function. It however cannot be used on simple expression rule. Because it is a writer function, it needs to be used in combination with bind(). You can however use it in SAIL form, and it will work only if user interacts with some SAIL component. If your aim is just to test your web API within Appian, you can use the HTTP Query smart service from the process model. That would be convenient.
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0 venkateshamu
A Score Level 2
over 7 years ago

@jasmins, AFAIK the httpQuery function used for "GET" (default), "HEAD", "OPTIONS", and "TRACE" methods will not work for "POST" method. To call the POST method WEBAPI's you have to use httpwrite function which returns a writer and must be used with the bind() function. For more info you can check below links "https://forum.appian.com/suite/help/16.3/Connector_Functions.html#a-httpquery"
"https://forum.appian.com/suite/help/16.3/Connector_Functions.html#a-httpwrite".
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0 jasmins over 7 years ago

@chetany : As you suggested ,I have tried to trigger it using http query smart service with post method but now I am getting "HTTP/1.1 500 Internal Server Error"
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0 venkateshamu
A Score Level 2
over 7 years ago

@jasmins, could you verify endpoint and method (should be POST) which are passing as inputs to the httpquery smart services once.
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