How to bridge from a webhook URL to a HTTP POST request? - api

Question

I want to make a HTTP POST request to Twilio but the calling service only allows me to enter a webhook URL.
I was trying to bridge this with apigee's API proxy but I could not figure out how to make it work.
The flow is like this:
A chat bot on motion.ai calls a web hook URL at a certain point.
The call should make an outbound call via twilio.com which requires a HTTP POST request, see here.
The POST request looks like this:
$ curl -XPOST https://api.twilio.com/2010-04-01/Accounts/<...>/Calls.json \
--data-urlencode "Url=http://demo.twilio.com/docs/voice.xml" \
--data-urlencode "To=<...>" \
--data-urlencode "From=<...>" \
-u '<...>:<...>'
What is the easiest way to bridge this?

Answer 1

I managed to setup an API proxy with Apigee to convert the HTTP GET request to a HTTP POST request.
Create a API proxy in Apigee and add a Basic Authentication policy:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<BasicAuthentication async="false" continueOnError="false" enabled="true" name="Basic-Authentication-1">
<DisplayName>Basic Authentication-1</DisplayName>
<Operation>Encode</Operation>
<IgnoreUnresolvedVariables>false</IgnoreUnresolvedVariables>
<User ref="request.queryparam.username"/>
<Password ref="request.queryparam.password"/>
<AssignTo createNew="false">request.header.Authorization</AssignTo>
<Source>request.header.Authorization</Source>
</BasicAuthentication>
Next add a Assign Message policy:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<AssignMessage async="false" continueOnError="false" enabled="true" name="Assign-Message-1">
<DisplayName>ConvertQueryToFormParameters</DisplayName>
<Properties/>
<Copy source="request">
<Headers/>
<QueryParams/>
<FormParams/>
<Payload/>
<Verb/>
<StatusCode/>
<ReasonPhrase/>
<Path/>
</Copy>
<Add/>
<Set>
<FormParams>
<FormParam name="To">{request.queryparam.To}</FormParam>
<FormParam name="From">{request.queryparam.From}</FormParam>
<FormParam name="Url">{request.queryparam.Url}</FormParam>
</FormParams>
<Verb>POST</Verb>
</Set>
<IgnoreUnresolvedVariables>true</IgnoreUnresolvedVariables>
</AssignMessage>
Then you can make a POST request to Twilio by simply calling
https://<yourApigeeApiUrl>.apigee.net/<yourApiName>?username=<yourTwilioApiUsername>&password=<yourTwilioApiPassword>&...