Introduction
Welcome to this comprehensive guide on HTTP Requests Rate-Limiting feature, a crucial part of the Empress framework. This feature enables developers to ensure the robustness and efficiency of their software applications by controlling the rate at which HTTP requests are processed.
Introduction to Rate-Limiting
Rate-Limiting is an essential component in managing server resources and maintaining the integrity of APIs. It allows you to control the number of HTTP requests a client can make in a specific window of time. In the Empress framework, this is implemented based on the time consumed by the requests. This provides an efficient way of limiting resource usage and ensuring fair usage of server resources.
Enabling Rate-Limiting in Empress
Rate-Limiting can be enabled by adding specific configuration to the site_config.json file in your site. Here is an example of such configuration:
{
"rate_limit": {
"limit": 600,
"window": 3600
}
}
The limit key specifies the maximum amount of time (in seconds) permitted to be used in the rate limit window. The window key defines the size of the rate limit window (in seconds).
**Note: ** When the limit is exceeded, the request will not be processed and an HTTP 429 (Too Many Requests) response will be returned.
HTTP Headers and Rate-Limiting
Each HTTP request returns headers that display the current rate limit status. Here is an example of how these headers might look:
curl -i https://frappe.io/docs
HTTP/1.1 200 OK
X-RateLimit-Limit: 600000000
X-RateLimit-Remaining: 518060453
X-RateLimit-Reset: 3513
X-RateLimit-Used: 100560
In cases where the configured limits are exhausted, HTTP 429 response is returned along with the rate limit status:
curl -i https://frappe.io/docs
HTTP/1.1 429 TOO MANY REQUESTS
X-RateLimit-Limit: 600000000
X-RateLimit-Remaining: 0
X-RateLimit-Reset: 1242
Retry-After: 1242
Conclusion
In summary, the HTTP Requests Rate-Limiting feature in the Empress framework is an essential tool for managing server resources effectively. It provides developers with a straightforward way of controlling the rate at which HTTP requests are processed by their applications. By carefully configuring the rate limits, developers can ensure the robustness and efficiency of their applications, leading to improved user experience and system performance.