Function proxy_http_handler

modules/proxy/mod_proxy_http.c:1870–2103

* This handles http:// URLs, and other URLs using a remote proxy over http * If proxyhost is NULL, then contact the server directly, otherwise * go via the proxy. * Note that if a proxy is used, then URLs other than http: can be accessed, * also, if we have trouble which is clearly specific to the proxy, then * we return DECLINED so that we can try another proxy. (Or the direct * route.) */

 * route.)
 */
static int proxy_http_handler(request_rec *r, proxy_worker *worker,
                              proxy_server_conf *conf,
                              char *url, const char *proxyname,
                              apr_port_t proxyport)
{
    int status;
    const char *scheme;
    const char *u = url;
    proxy_http_req_t *req = NULL;
    proxy_conn_rec *backend = NULL;
    apr_bucket_brigade *input_brigade = NULL;
    int is_ssl = 0;
    conn_rec *c = r->connection;
    proxy_dir_conf *dconf;
    int retry = 0;
    char *locurl = url;
    int toclose = 0;
    /*
     * Use a shorter-lived pool to reduce memory usage
     * and avoid a memory leak
     */
    apr_pool_t *p = r->pool;
    apr_uri_t *uri;

    scheme = get_url_scheme(&u, &is_ssl);
    if (!scheme && proxyname && strncasecmp(url, "ftp:", 4) == 0) {
        u = url + 4;
        scheme = "ftp";
        is_ssl = 0;
    }
    if (!scheme || u[0] != '/' || u[1] != '/' || u[2] == '\0') {
        ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01113)
                      "HTTP: declining URL %s", url);
        return DECLINED; /* only interested in HTTP, WS or FTP via proxy */
    }
    if (is_ssl && !ap_ssl_has_outgoing_handlers()) {
        ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01112)
                      "HTTP: declining URL %s (mod_ssl not configured?)", url);
        return DECLINED;
    }
    ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r, "HTTP: serving URL %s", url);

    /* create space for state information */
    if ((status = ap_proxy_acquire_connection(scheme, &backend,
                                              worker, r->server)) != OK) {
        return status;
    }

    backend->is_ssl = is_ssl;

    req = apr_pcalloc(p, sizeof(*req));
    req->p = p;
    req->r = r;
    req->sconf = conf;
    req->worker = worker;
    req->backend = backend;
    req->proto = scheme;
    req->bucket_alloc = c->bucket_alloc;