HTTP模块

核心模块阶段

flowchart TD subgraph POST_READ realip(realip) end subgraph SERVER_REWRITE rewrite(rewrite) end subgraph FIND_CONFIG NULL(NULL) end subgraph REWRITE rewrite2(rewrite) end subgraph POST_REWRITE NULL2(NULL) end subgraph PREACCESS direction LR degradation(degradation) --> limit_conn(limit_conn) limit_conn --> limit_req(limit_req) limit_req --> realip2(realip) end subgraph ACCESS direction LR access(access) --> auth(auth) end subgraph POST_ACCESS NULL3(NULL) end subgraph PRECONTENT direction LR mirror(mirror) --> try_files(try_files) end subgraph CONTENT direction LR static(static) --> gzip_static(gzip_static) gzip_static --> dav(dav) dav --> autoindex(autoindex) autoindex --> index(ndex) index --> random_index(random_index) end subgraph LOG log(log) end POST_READ --> SERVER_REWRITE SERVER_REWRITE --> FIND_CONFIG FIND_CONFIG --> REWRITE REWRITE --> POST_REWRITE POST_REWRITE --> PREACCESS PREACCESS --> ACCESS ACCESS --> POST_ACCESS POST_ACCESS --> PRECONTENT PRECONTENT --> CONTENT CONTENT --> LOG

  • POST_REWRITE阶段如果有rewrite，则会跳回到FIND_CONFIG阶段

  • 源代码中定义,如下图所示: http_phase图

FastCGI模块

sequenceDiagram actor n as nginx进程 actor c as CGI进程 n->>c: begin_request处理开始 n->>c: params请求参数 n->>+c: stdin请求数据内容 c->>c:请求处理 c-->>-n: stdout处理结果 c-->>n: end_request处理结束

static模块

把请求url中path映射本地路径,读取本地文件返回客户端

核心源代码,如下图所示: static_module图

index模块

引入配置参数index,如下图所示: index_command图

请求url为目录时,把配置参数index值附加在url上,然后内部转跳



static ngx_int_t
ngx_http_index_handler(ngx_http_request_t *r)
{
    ...
    if (index[i].name.data[0] == '/') {
                return ngx_http_internal_redirect(r, &index[i].name, &r->args);
            }
    ...

    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                       "open index \"%V\"", &path);

    ...
    return ngx_http_internal_redirect(r, &uri, &r->args);
}

转跳调试日志,如下图所示: index_redirect图