HTTP Payload Transformation via Single-Pass Regular Expression Parsing
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Solution Overview
Problem
Existing web proxies are inefficient due to multiple passes through HTTP payload for transformation, leading to slow processing and increased latency, as they require the entire payload to be received and processed.
Innovation Solution
Implementing a single-pass payload transformation technique using a proxy server that processes HTTP payloads in real-time without buffering, utilizing regular expressions and capture tables to perform transformations as packets are received, reducing the need for multiple scans and memory usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple passes through HTTP payload are used for transformation, then transformation accuracy is improved, but processing speed deteriorates
Solution Approach 1:
The patent applies preliminary action by performing payload transformation as soon as the initial portion of the payload is received, rather than waiting for the complete payload. The proxy server transforms the payload in a single pass using the received portion, which improves processing speed while maintaining acceptable transformation accuracy for most cases.
Solution Approach 2:
The patent applies partial action by transforming only the portion of the payload that has been received so far, rather than requiring the entire payload to be received before transformation begins. This allows the system to perform partial transformations incrementally, improving overall processing throughput.
2Manufacturing precision
If multiple passes through HTTP payload are used for transformation, then transformation completeness is improved, but latency increases
Solution Approach 1:
The patent reduces latency by performing preliminary transformation actions as soon as the initial payload portion is received, rather than waiting for complete payload reception. This single-pass approach begins transformation immediately, significantly reducing the time delay compared to multi-pass methods that must wait for the entire payload.
Solution Approach 2:
The patent applies the skipping principle by rushing through the transformation process in a single pass rather than methodically going through multiple passes. The proxy server processes and transforms the payload portion that is available, skipping the waiting time that would be required for complete payload reception in traditional multi-pass approaches.
3Manufacturing precision
If entire payload is buffered before processing, then transformation accuracy is improved, but memory usage increases
Solution Approach 1:
The patent applies segmentation by dividing the payload processing into segments based on what has been received so far. Instead of requiring the entire payload to be buffered in memory, the system processes the payload in segments as they arrive, transforming the initial portion first and continuing with subsequent portions, thereby reducing peak memory usage.
Solution Approach 2:
The patent applies partial action by performing transformation on only the portion of the payload that has been received, rather than buffering the entire payload before any transformation occurs. This incremental approach transforms what is available in memory at each moment, reducing the total memory footprint required for the transformation process.
Data Source
AI summary
In an embodiment, a method of payload matching via a single pass transformation of an HTTP payload includes receiving a payload packet destined for a recipient and parsing the payload packet in a single scan of the packet using a combined regular expression. The combined regular expression includes a plurality of regular expressions that correspond to a set of replacement rules. The method includes determining a scatter-gather list conforming to the rule, constructing a new payload packet based on the scatter-gather list, and sending the new payload packet to the recipient.