50 lines
1.9 KiB
Markdown
50 lines
1.9 KiB
Markdown
---
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title: "Visitor Threshold"
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description: "Visitor threshold is used to split traffic into levels. If
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the traffic level supersceedes the configured threshold, then mCaptcha will
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increase difficulty factor based on the configuration provided."
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lead: ""
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date: 2022-07-22
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lastmod: 2022-07-22 20:17
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draft: false
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images: []
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menu:
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docs:
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parent: "Terminology"
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weight: 525
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toc: true
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---
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mCaptcha's variable difficulty factor mechanism requires a website's traffic
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statistics be split into levels, so that it can deploy the right
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difficulty factor for each level.
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Visitor threshold is used to traffic into levels and mCaptcha accepts a
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difficulty configuration for each of these levels. When current traffic
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exceeds a difficulty factor, mCaptcha will increase the difficulty
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factor to the next configured level.
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For instance, consider the configuration given below:
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- Cool down period: 30 seconds
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| Level | Difficulty Factor | Visitor Threshold |
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| ----- | ----------------- | ----------------- |
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| 1 | 5,000 | 2,000 |
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| 2 | 50,000 | 5,000 |
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| 3 | 500,000 | 10,000 |
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| 4 | 5,000,000 | 15,000 |
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If the website sees 2,000 requests in a 30 second window, level 1
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difficulty factor(5,000) will be deployed. If the traffic increases to
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5,000 requests in a 30 second window, then difficulty factor will be
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upgraded to level 2(50,000). Likewise 10,000 and 15,000 requests over 30
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seconds will result in difficulty factor being upgraded to 500,000 and
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5,000,000 respectively.
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Visitor threshold is how mCaptcha determines which difficulty factor
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level to deploy. mCaptcha uses leaky bucket algorithm to keep the
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visitor threshold constantly updated within the configured cool down
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period. So, at any given moment the, the current visitor level will be
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the amount of traffic that was served in the cool down period specified.
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