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docs(middleware): update README to clarify request-variable substitution

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Added details on request-variable substitution, explaining how it
reads fields from the active outbound request and resolves upstream
variables from the current route context.
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yusing
2026-04-19 15:16:54 +08:00
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internal/net/gphttp/middleware/README.md
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@@ -16,6 +16,8 @@ This package implements a flexible HTTP middleware system for GoDoxy. Middleware
Response body rewriting is only applied to unencoded, text-like content types (for example `text/*`, JSON, YAML, XML). Response status and headers can always be modified.
Request-variable substitution reads request fields from the active outbound request. Upstream variables such as `$upstream_host` and `$upstream_url` resolve from the current route context, which is normally attached by the route / reverse-proxy layer before middleware executes.
## Architecture
```mermaid