This post shows how to customize the HTTP client used by the Java Twilio helper library. This lets you work with multiple accounts, HTTP proxies and low-level configuration over your clients.
When building a Java application that uses Twilio's API most developers will have code that runs at startup, initializing the Twilio helper library like this:
Twilio.init( TWILIO_ACCOUNT_SID, TWILIO_AUTH_TOKEN);
This sets the account credentials as static fields in the
Twilio class. Effectively they are now global settings for the application, and when your code calls the API these will be used automatically, and the helper library creates an HTTP client for you. This means that you don't have to repeat your credentials every time you call a method that uses the Twilio API:
Message.creator(TO_NUMBER, FROM_NUMBER, "Hello 👋").create();
This is convenient, however there are cases where you want more control over the HTTP client. This might be to configure an HTTP proxy, or to provide custom credentials if you are using multiple Twilio accounts or Projects in the same codebase.
To enable this, all the methods which call the Twilio API are overloaded to take an instance of
TwilioRestClient. If you pass a
TwilioRestClient each time you call any of the create/read/update/delete methods, you will no longer need to call
Twilio.init(), you can customize your HTTP clients and use as many different instances of them as you need.
In this post I'll show how to do that for a couple of common cases:
The code samples are all in a repo on GitHub, too.
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