怎样让squid follow 302的响应

大家都知道，http的302响应，是一种跳转。比如用户访问url:

时，

GET / HTTP/1.1

User-Agent: curl/7.15.5 (x86_64-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5

Host:

Accept: */*

sina的服务器会返回一个301的响应（302也类似），让你的浏览器去访问

HTTP/1.0 301 Moved Permanently

Date: Sun, 06 Jan 2013 10:16:17 GMT

Server: Apache

Location: http://.cn/

Cache-Control: max-age=3600

Expires: Sun, 06 Jan 2013 11:16:17 GMT

Vary: Accept-Encoding

Content-Length: 231

Content-Type: text/html; charset=iso-8859-1

Age: 3015

X-Cache: HIT from sh201-12.sina.com.cn

Connection: close

squid在处理301或302的响应时，只能把这个30x响应给到客户端，然后由客户端发起对 的请求。

那么，能不能让squid在客户端请求 的时候，直接返回 的200内容呢？

其实非常简单，只要几十行代码就搞定！

接下来我就手把手教给你怎么做

 

首先，在client_side.c里面，加上这个函数clientProcess302Header

//add by xiaosi start

static void clientProcess302Header(void *data, HttpReply * rep)

{

        clientHttpRequest *http = data;

        HttpHeaderEntry *location_entry = httpHeaderFindEntry(&rep->header, HDR_LOCATION);

        if(!location_entry)

        {

                http->orig_header_callback(data, rep);

                return;

        }



        char *location = xstrdup(strBuf(location_entry->value));

        http->location = location;

        http->out.offset = 0;

        http->out.size = 0;

        StoreEntry *e;

        if ((e = http->entry))

        {

                http->entry = NULL;

                storeClientUnregister (http->sc, e, http);

                http->sc = NULL;

                storeUnlockObject (e);

        }

        /* old_entry might still be set if we didn't yet get the reply

         * code in clientHandleIMSReply() */

        if ((e = http->old_entry))

        {

                http->old_entry = NULL;

                storeClientUnregister (http->old_sc, e, http);

                http->old_sc = NULL;

                storeUnlockObject (e);

        }

        clientRedirectStart(http);

}

//add by xiaosi end

然后修改storeClientCopyHeaders，改成下面的样子。注意add by xiaosi注释里面的代码

void

storeClientCopyHeaders(store_client * sc, StoreEntry * e, STHCB * callback, void *callback_data)

{

    clientHttpRequest *http = callback_data;

//add by xiaosi start

//  http->header_callback = callback;

    http->header_callback = clientProcess302Header;

    http->orig_header_callback = callback;

//add by xiaosi end

    http->header_entry = e;

    storeClientCopy(http->sc, e, 0, 0, STORE_CLIENT_BUF_SZ, memAllocate(MEM_STORE_CLIENT_BUF), storeClientCopyHeadersCB, http);

}

然后修改client_side_rewrite.c里面的clientRedirectStart，注意add by xiaosi注释里面的代码

void

clientRedirectStart(clientHttpRequest * http)

{

    debug(33, 5) ("clientRedirectStart: '%s'\n", http->uri);

    //add by xiaosi start

    if(http->location)

    {

            http->redirect_state = REDIRECT_PENDING;

            char *location = xstrdup(http->location);

            safe_free(http->location);

            clientRedirectDone (http, location);

            safe_free(location);

            return;

    }

    //add by xiaosi end

    if (Config.Program.url_rewrite.command == NULL) {

        clientRedirectDone(http, NULL);

        return;

    }

    if (Config.accessList.url_rewrite) {

        http->acl_checklist = clientAclChecklistCreate(Config.accessList.url_rewrite, http);

        aclNBCheck(http->acl_checklist, clientRedirectAccessCheckDone, http);

    } else {

        redirectStart(http, clientRedirectDone, http);

    }

}

注意，我们在clientHttpRequest中加入了2个成员，location和orig_header_callback。在structs.h的struct _clientHttpRequest 结构的末尾加上他们。注意add by xiaosi注释里面的代码

struct _clientHttpRequest {

// bla bla bla…

// bla bla bla…

// bla bla bla…



    dlink_node active;

    squid_off_t maxBodySize;

    STHCB *header_callback;     /* Temporarily here for storeClientCopyHeaders */

    StoreEntry *header_entry;   /* Temporarily here for storeClientCopyHeaders */

    int is_modified;

    //add by xiaosi start

    char *location;

    STHCB *orig_header_callback;        /* Temporarily here for storeClientCopyHeaders */

//add by xiaosi end

};

 

基本上就完工了。重新编译安装，重启squid。再通过squid请求一下 是不是看到200了呢？