What Makes It ComplexChallenges in HTTP parsingThe Evolution of the HTTP ProtocolOver the years, http spec has significantly evolved. This creates a trade-off between request size, memory consumption, and throughput. However, this introduces constraints on memory usage, limits on the maximum header size the proxy can handle, and other performance-related optimizations. While HTTP header names are case-insensitive per the spec, this normalization can occasionally cause issues with non-compliant clients or servers. The User-Agent header is one of the most commonly used HTTP headers to identify the client making the request.