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Ngx_buf_t

As explained in Refactoring to Rust

ngx_buf_t is an NGINX buffer structure that stores metadata and pointers describing a block of response data.

ngx_buf_t describes a block of response data through metadata and pointers. Allocate it from the request’s NGINX memory pool, then configure its handling flags before sending the response. section 4.6

Building a response buffer

Allocate storage with ngx_pcalloc, copy the response bytes into it, assign buf.pos and buf.last, wrap the buffer in ngx_chain_t, and pass the chain to ngx_http_output_filter.

How Refactoring to Rust covers it

How deep it goes
Explains allocation, flags, copied bytes, and endpoint pointers, but omits most structure fields.
Examples
Uses a copied calculator response string, pointer assignments, and a chained buffer sent through the HTTP output filter.
What it assumes
Assumes NGINX request handling, Rust unsafe pointers, and C-compatible FFI types; teaches request-pool allocation and buffer setup.
What you can do after
Build it from scratch as a request-scoped NGINX response buffer and submit it through the output filter chain.
How it connects
Connects response bodies with NGINX memory pools, ngx_chain_t, pointers, and HTTP output filtering.
Cover of Refactoring to Rust
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