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vikash-agrawal
vikash-agrawal

Posted on • Updated on

API Gateway

Proxy

Proxy is a dedicated computer or software system running in the same computer or different computer acts as intermidiary between the requester of a website and the actual web server.
Type of proxy:
• Forward Proxy: it helps in connecting the user to the website.
• Reverse Proxy: it is used:

o To allow load balancing between the server.
o To stream internal content to its user. (SSO page)
o To block some particular website.
Nginx 
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Load balancers:

• With the many servers configured as upstreams, you can define proxy_pass to this upstreams.
• There are multiple types of load balancers:

o Round Robin: this is by default.
o least_conn: the one with the least client connection will be picked up.
o ip_hash: each of the client has some unique key, the first few characters of this key works as server chooser. It helps in speeding up the process.
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• To provide high availability load balancers, you can plug in external load balancer also.
• Caching

o Various cache related information like path, key, validity can be configured to improve the performance.
o User data is suggested not to be cached to avoid sharing one user data with other user.
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API Gateway

It is used to manage the API, also referred as translator, which includes
• combining more than 1 APIs into 1
• combining responses from more than 1 API into 1
• Providing the default data/message in case of error from any API invocation
• Security management

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