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src/http/modules/ngx_http_proxy_module.c  view on Meta::CPAN

    ngx_string("X-Accel-Redirect"),
    ngx_string("X-Accel-Limit-Rate"),
    ngx_string("X-Accel-Buffering"),
    ngx_string("X-Accel-Charset"),
    ngx_null_string
};


#if (NGX_HTTP_CACHE)

static ngx_keyval_t  ngx_http_proxy_cache_headers[] = {
    { ngx_string("Host"), ngx_string("$proxy_host") },
    { ngx_string("Connection"), ngx_string("close") },
    { ngx_string("Content-Length"), ngx_string("$proxy_internal_body_length") },
    { ngx_string("Transfer-Encoding"), ngx_string("$proxy_internal_chunked") },
    { ngx_string("TE"), ngx_string("") },
    { ngx_string("Keep-Alive"), ngx_string("") },
    { ngx_string("Expect"), ngx_string("") },
    { ngx_string("Upgrade"), ngx_string("") },
    { ngx_string("If-Modified-Since"),
      ngx_string("$upstream_cache_last_modified") },
    { ngx_string("If-Unmodified-Since"), ngx_string("") },
    { ngx_string("If-None-Match"), ngx_string("$upstream_cache_etag") },
    { ngx_string("If-Match"), ngx_string("") },
    { ngx_string("Range"), ngx_string("") },
    { ngx_string("If-Range"), ngx_string("") },
    { ngx_null_string, ngx_null_string }
};

#endif


static ngx_http_variable_t  ngx_http_proxy_vars[] = {

    { ngx_string("proxy_host"), NULL, ngx_http_proxy_host_variable, 0,
      NGX_HTTP_VAR_CHANGEABLE|NGX_HTTP_VAR_NOCACHEABLE|NGX_HTTP_VAR_NOHASH, 0 },

    { ngx_string("proxy_port"), NULL, ngx_http_proxy_port_variable, 0,
      NGX_HTTP_VAR_CHANGEABLE|NGX_HTTP_VAR_NOCACHEABLE|NGX_HTTP_VAR_NOHASH, 0 },

    { ngx_string("proxy_add_x_forwarded_for"), NULL,
      ngx_http_proxy_add_x_forwarded_for_variable, 0, NGX_HTTP_VAR_NOHASH, 0 },

#if 0
    { ngx_string("proxy_add_via"), NULL, NULL, 0, NGX_HTTP_VAR_NOHASH, 0 },
#endif

    { ngx_string("proxy_internal_body_length"), NULL,
      ngx_http_proxy_internal_body_length_variable, 0,
      NGX_HTTP_VAR_NOCACHEABLE|NGX_HTTP_VAR_NOHASH, 0 },

    { ngx_string("proxy_internal_chunked"), NULL,
      ngx_http_proxy_internal_chunked_variable, 0,
      NGX_HTTP_VAR_NOCACHEABLE|NGX_HTTP_VAR_NOHASH, 0 },

    { ngx_null_string, NULL, NULL, 0, 0, 0 }
};


static ngx_path_init_t  ngx_http_proxy_temp_path = {
    ngx_string(NGX_HTTP_PROXY_TEMP_PATH), { 1, 2, 0 }
};


static ngx_int_t
ngx_http_proxy_handler(ngx_http_request_t *r)
{
    ngx_int_t                    rc;
    ngx_http_upstream_t         *u;
    ngx_http_proxy_ctx_t        *ctx;
    ngx_http_proxy_loc_conf_t   *plcf;
#if (NGX_HTTP_CACHE)
    ngx_http_proxy_main_conf_t  *pmcf;
#endif

    if (ngx_http_upstream_create(r) != NGX_OK) {
        return NGX_HTTP_INTERNAL_SERVER_ERROR;
    }

    ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_proxy_ctx_t));
    if (ctx == NULL) {
        return NGX_HTTP_INTERNAL_SERVER_ERROR;
    }

    ngx_http_set_ctx(r, ctx, ngx_http_proxy_module);

    plcf = ngx_http_get_module_loc_conf(r, ngx_http_proxy_module);

    u = r->upstream;

    if (plcf->proxy_lengths == NULL) {
        ctx->vars = plcf->vars;
        u->schema = plcf->vars.schema;
#if (NGX_HTTP_SSL)
        u->ssl = (plcf->upstream.ssl != NULL);
#endif

    } else {
        if (ngx_http_proxy_eval(r, ctx, plcf) != NGX_OK) {
            return NGX_HTTP_INTERNAL_SERVER_ERROR;
        }
    }

    u->output.tag = (ngx_buf_tag_t) &ngx_http_proxy_module;

    u->conf = &plcf->upstream;

#if (NGX_HTTP_CACHE)
    pmcf = ngx_http_get_module_main_conf(r, ngx_http_proxy_module);

    u->caches = &pmcf->caches;
    u->create_key = ngx_http_proxy_create_key;
#endif

    u->create_request = ngx_http_proxy_create_request;
    u->reinit_request = ngx_http_proxy_reinit_request;
    u->process_header = ngx_http_proxy_process_status_line;
    u->abort_request = ngx_http_proxy_abort_request;
    u->finalize_request = ngx_http_proxy_finalize_request;
    r->state = 0;