晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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/*
 * Copyright 2000-2025 The OpenSSL Project Authors. All Rights Reserved.
 * Copyright Siemens AG 2018-2020
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#ifndef OPENSSL_HTTP_H
#define OPENSSL_HTTP_H
#pragma once

#include <openssl/opensslconf.h>

#include <openssl/bio.h>
#include <openssl/asn1.h>
#include <openssl/conf.h>

#ifdef __cplusplus
extern "C" {
#endif

#define OSSL_HTTP_NAME "http"
#define OSSL_HTTPS_NAME "https"
#define OSSL_HTTP_PREFIX OSSL_HTTP_NAME "://"
#define OSSL_HTTPS_PREFIX OSSL_HTTPS_NAME "://"
#define OSSL_HTTP_PORT "80"
#define OSSL_HTTPS_PORT "443"
#define OPENSSL_NO_PROXY "NO_PROXY"
#define OPENSSL_HTTP_PROXY "HTTP_PROXY"
#define OPENSSL_HTTPS_PROXY "HTTPS_PROXY"

/* We want to have this even in case of OPENSSL_NO_HTTP */
int OSSL_parse_url(const char *url, char **pscheme, char **puser, char **phost,
    char **pport, int *pport_num,
    char **ppath, char **pquery, char **pfrag);

#ifndef OPENSSL_NO_HTTP

#define OSSL_HTTP_DEFAULT_MAX_LINE_LEN (4 * 1024)
#define OSSL_HTTP_DEFAULT_MAX_RESP_LEN (100 * 1024)
#define OSSL_HTTP_DEFAULT_MAX_CRL_LEN (32 * 1024 * 1024)
#define OSSL_HTTP_DEFAULT_MAX_RESP_HDR_LINES 256

/* Low-level HTTP API */
OSSL_HTTP_REQ_CTX *OSSL_HTTP_REQ_CTX_new(BIO *wbio, BIO *rbio, int buf_size);
void OSSL_HTTP_REQ_CTX_free(OSSL_HTTP_REQ_CTX *rctx);
int OSSL_HTTP_REQ_CTX_set_request_line(OSSL_HTTP_REQ_CTX *rctx, int method_POST,
    const char *server, const char *port,
    const char *path);
int OSSL_HTTP_REQ_CTX_add1_header(OSSL_HTTP_REQ_CTX *rctx,
    const char *name, const char *value);
int OSSL_HTTP_REQ_CTX_set_expected(OSSL_HTTP_REQ_CTX *rctx,
    const char *content_type, int asn1,
    int timeout, int keep_alive);
int OSSL_HTTP_REQ_CTX_set1_req(OSSL_HTTP_REQ_CTX *rctx, const char *content_type,
    const ASN1_ITEM *it, const ASN1_VALUE *req);
int OSSL_HTTP_REQ_CTX_nbio(OSSL_HTTP_REQ_CTX *rctx);
int OSSL_HTTP_REQ_CTX_nbio_d2i(OSSL_HTTP_REQ_CTX *rctx,
    ASN1_VALUE **pval, const ASN1_ITEM *it);
BIO *OSSL_HTTP_REQ_CTX_exchange(OSSL_HTTP_REQ_CTX *rctx);
BIO *OSSL_HTTP_REQ_CTX_get0_mem_bio(const OSSL_HTTP_REQ_CTX *rctx);
size_t OSSL_HTTP_REQ_CTX_get_resp_len(const OSSL_HTTP_REQ_CTX *rctx);
void OSSL_HTTP_REQ_CTX_set_max_response_length(OSSL_HTTP_REQ_CTX *rctx,
    unsigned long len);
void OSSL_HTTP_REQ_CTX_set_max_response_hdr_lines(OSSL_HTTP_REQ_CTX *rctx,
    size_t count);
int OSSL_HTTP_is_alive(const OSSL_HTTP_REQ_CTX *rctx);

/* High-level HTTP API */
typedef BIO *(*OSSL_HTTP_bio_cb_t)(BIO *bio, void *arg, int connect, int detail);
OSSL_HTTP_REQ_CTX *OSSL_HTTP_open(const char *server, const char *port,
    const char *proxy, const char *no_proxy,
    int use_ssl, BIO *bio, BIO *rbio,
    OSSL_HTTP_bio_cb_t bio_update_fn, void *arg,
    int buf_size, int overall_timeout);
int OSSL_HTTP_proxy_connect(BIO *bio, const char *server, const char *port,
    const char *proxyuser, const char *proxypass,
    int timeout, BIO *bio_err, const char *prog);
int OSSL_HTTP_set1_request(OSSL_HTTP_REQ_CTX *rctx, const char *path,
    const STACK_OF(CONF_VALUE) *headers,
    const char *content_type, BIO *req,
    const char *expected_content_type, int expect_asn1,
    size_t max_resp_len, int timeout, int keep_alive);
BIO *OSSL_HTTP_exchange(OSSL_HTTP_REQ_CTX *rctx, char **redirection_url);
BIO *OSSL_HTTP_get(const char *url, const char *proxy, const char *no_proxy,
    BIO *bio, BIO *rbio,
    OSSL_HTTP_bio_cb_t bio_update_fn, void *arg,
    int buf_size, const STACK_OF(CONF_VALUE) *headers,
    const char *expected_content_type, int expect_asn1,
    size_t max_resp_len, int timeout);
BIO *OSSL_HTTP_transfer(OSSL_HTTP_REQ_CTX **prctx,
    const char *server, const char *port,
    const char *path, int use_ssl,
    const char *proxy, const char *no_proxy,
    BIO *bio, BIO *rbio,
    OSSL_HTTP_bio_cb_t bio_update_fn, void *arg,
    int buf_size, const STACK_OF(CONF_VALUE) *headers,
    const char *content_type, BIO *req,
    const char *expected_content_type, int expect_asn1,
    size_t max_resp_len, int timeout, int keep_alive);
int OSSL_HTTP_close(OSSL_HTTP_REQ_CTX *rctx, int ok);

/* Auxiliary functions */
int OSSL_HTTP_parse_url(const char *url, int *pssl, char **puser, char **phost,
    char **pport, int *pport_num,
    char **ppath, char **pquery, char **pfrag);
const char *OSSL_HTTP_adapt_proxy(const char *proxy, const char *no_proxy,
    const char *server, int use_ssl);

#endif /* !defined(OPENSSL_NO_HTTP) */
#ifdef __cplusplus
}
#endif
#endif /* !defined(OPENSSL_HTTP_H) */