Varnish http_req_hdr_len 参数不适用于请求 header 大小 > 8KB

Question

我试图在 varnishd 命令中将最大请求 header 大小设置为 16KB。这是 varnishd 命令的样子：

/usr/sbin/varnishd \
        -P /var/run/varnish.pid \
        -f $VARNISH_VCL_CONF \
        -a ${VARNISH_LISTEN_ADDRESS}:${VARNISH_LISTEN_PORT} \
        -T ${VARNISH_ADMIN_LISTEN_ADDRESS}:${VARNISH_ADMIN_LISTEN_PORT} \
        -p http_req_hdr_len=16384 \
        -p http_resp_hdr_len=16384 \
        -t $VARNISH_TTL \
        -S $VARNISH_SECRET_FILE \
        -s $VARNISH_STORAGE \

使用上述配置，当我尝试执行 header 大小超过 8KB 的请求时，varnish 不接受该请求。我已经在 vcl_recv 方法中放入了 LOG 语句，但是这些请求的 varnishlog 中没有出现任何内容。我确信这些参数 (http_req_hdr_len) 有效，因为当我将它们设置为最低级别（比如 40 字节）时，varnish 不接受正常请求（例如 header 大小约为 2KB 的请求）。

正在按要求添加 header 列表：

:scheme: https accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9 accept-encoding: gzip, deflate, br accept-language: en-GB,en-US;q=0.9,en;q=0.8 cache-control: no-cache cookie: heavy-cookie=heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookieheavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookieheavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-ccookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookiokie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-hea; at_check=true; AMCVS_AD455AA8591B70C90A495EA3%40AdobeOrg=1; geoPreference=denied;  ippo-ab.d=%7B%22vid%22%3A%2246604622306408834460545976289125483240%22%2C%22vehicles%22%3A%7B%22etc%22%3A%7B%22lvl%22%3A0%2C%22myy%22%3A%22%22%2C%22year%22%3A%22%22%2C%22make%22%3A%22%22%2C%22veh%22%3A%22%22%2C%22trim%22%3A%22%22%2C%22tpms%22%3A%22%22%2C%22dt%22%3A%22%22%7D%2C%22tce%22%3A%7B%22lvl%22%3A4%2C%22myy%22%3A%222016-Audi-allroad%22%2C%22year%22%3A%222016%22%2C%22make%22%3A%22Audi%22%2C%22model%22%3A%22allroad%22%2C%22trim%22%3A%22Premium%22%2C%22tpms%22%3A%221%22%2C%22dt%22%3A%2203%2F08%2F2021%2008%3A08%3A02%20GMT%22%7D%2C%22aux%22%3A%7B%22lvl%22%3A0%2C%22myy%22%3A%22%22%2C%22year%22%3A%22%22%2C%22make%22%3A%22%22%2C%22model%22%3A%22%22%2C%22engine%22%3A%22%22%2C%22dt%22%3A%22%22%7D%7D%2C%22site%22%3A%22FCAC%22%2C%22location%22%3A%7B%22deviceNumber%22%3A%22357166%22%2C%22locationLvl%22%3A2%2C%22myZip%22%3A%2227455%22%2C%22myCity%22%3A%22%22%2C%22myState%22%3A%22%22%2C%22autoZip%22%3A%2260605%22%7D%2C%22tires%22%3A%7B%22main%22%3A%7B%22lvl%22%3A0%2C%22cs%22%3A%22%22%2C%22ar%22%3A%22%22%2C%22rs%22%3A%22%22%2C%22tireSize%22%3A%22%22%2C%22dt%22%3A%22%22%7D%2C%22tce%22%3A%7B%22lvl%22%3A0%2C%22cs%22%3A%22%22%2C%22ar%22%3A%22%22%2C%22rs%22%3A%22%22%2C%22tireSize%22%3A%22%22%2C%22dt%22%3A%22%22%7D%7D%7D%3Bipe.34220.pageViewedCount%3D6%3Bipe_34220_fov%3D%7B%22numberOfVisits%22%3A2%2C
    ix-dev.devicecaresystem.com%252Fbsro%252Fservices%252Fheavy-cookie%252C38%252C38%252C414%252C1536%252C414%252C1536%252C864%252C1.25%252CP%3B%20s_ppv%3D404%25253Ahttps%25253A%252F%252Fix-dev.devicecaresystem.com%252Fbsro%252Fservices%252Fheavy-cookie%252C38%252C38%252C414%252C1536%252C330%252C1536%252C864%252C1.25%252CP%3B; s_pers=%20s_vnum%3D1622717469965%2526vn%253D6%7C1622717469965%3B%20s_invisit%3Dtrue%7C1615204800559%3B%20last_v%3D1615203000568%7C1709811000568%3B%20last_v_s%3DLess%2520than%25201%2520day%7C1615204800568%3B%20gpv%3D404%253Ahttps%253A%252F%252Fix-dev.devicecaresystem.com%252Fbsro%252Fservices%252Fheavy-cookie%7C1615204800576%3B%20s_nr%3D1615203000580-Repeat%7C1646739000580%3B%20s_depth%3D1%7C1615204800586%3B pragma: no-cache sec-ch-ua: "Chromium";v="88", "Google Chrome";v="88", ";Not A Brand";v="99" sec-ch-ua-mobile: ?0 sec-fetch-dest: document sec-fetch-mode: navigate sec-fetch-site: none sec-fetch-user: ?1 upgrade-insecure-requests: 1 user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.190 Safari/537.36

Answer 1

Header 尺码

您可以调整 5 个参数来影响请求和响应的大小和长度 headers:

http_max_hdr：一个 HTTP 请求或响应可以包含的最大 header 数。默认值为 64
http_req_hdr_len：单个请求的最大大小header。默认为 8KB
http_req_size：HTTP请求的最大总大小。默认为 32 KB
http_resp_hdr_len：单个响应的最大尺寸header。默认为 8KB
http_resp_size：HTTP 响应的最大总大小headers。默认为 32 KB

因此，您不仅需要设置单个请求和响应 header 的最大大小，还需要设置请求和响应 header 消耗的总大小。另请记住，header 的数量限制为 64（默认情况下）。

工作区设置

游戏中还有另一个限制因素：单次游戏可以消耗的最大内存量request/response。

workspace_client：HTTP 请求处理的内存分配。默认值一共64KB
workspace_backend：后端处理的内存分配。默认值一共64KB

如果请求和响应总共有超过 64KB 的 headers，工作区限制将会生效。因此您还需要调整这些值。

测试您的长 cookie 用例

在测试了您的长 cookie 用例之后，我得出结论，如果 http_req_hdr_len 增加到 16k，Varnish 可以很好地处理这个问题。

这是我用于请求的 cookie 值：

Cookie: heavy-cookie=heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookieheavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookieheavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-ccookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookiokie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-heavy-cookie-hea; at_check=true; AMCVS_AD455AA8591B70C90A495EA3%40AdobeOrg=1; geoPreference=denied; _ga=GA1.3.1808662474.1614941482; aam_uuid=46420618758273943980528347843026907968;_fbp=fb.1.1614941482362.1143768601; _hjTLDTest=1; _hjid=35fdf3da-a2a0-4cba-b177-38c15d200d0e; cp_ip={%22ip%22:%22103.81.78.10%22%2C%22date%22:1614941482717}; hasSetPreferredStore=false; ipe_s=844f4d31-5961-eefa-84bf-7968471b368b; dtCookie=v_4_srv_6_sn_29841A9B58710C97DCDA42CB2D66CD48_perc_100000_ol_0_mul_1; _gid=GA1.3.352287190.1615185283; _hjIncludedInSessionSample=1; ipe.34220.pageViewedDay=67; _hjIncludedInPageviewSample=1; cp_merchTemp=Homepage; ippo-ab.d=%7B%22vid%22%3A%2246604622306408834460545976289125483240%22%2C%22vehicles%22%3A%7B%22etc%22%3A%7B%22lvl%22%3A0%2C%22myy%22%3A%22%22%2C%22year%22%3A%22%22%2C%22make%22%3A%22%22%2C%22veh%22%3A%22%22%2C%22trim%22%3A%22%22%2C%22tpms%22%3A%22%22%2C%22dt%22%3A%22%22%7D%2C%22tce%22%3A%7B%22lvl%22%3A4%2C%22myy%22%3A%222016-Audi-allroad%22%2C%22year%22%3A%222016%22%2C%22make%22%3A%22Audi%22%2C%22model%22%3A%22allroad%22%2C%22trim%22%3A%22Premium%22%2C%22tpms%22%3A%221%22%2C%22dt%22%3A%2203%2F08%2F2021%2008%3A08%3A02%20GMT%22%7D%2C%22aux%22%3A%7B%22lvl%22%3A0%2C%22myy%22%3A%22%22%2C%22year%22%3A%22%22%2C%22make%22%3A%22%22%2C%22model%22%3A%22%22%2C%22engine%22%3A%22%22%2C%22dt%22%3A%22%22%7D%7D%2C%22site%22%3A%22FCAC%22%2C%22location%22%3A%7B%22deviceNumber%22%3A%22357166%22%2C%22locationLvl%22%3A2%2C%22myZip%22%3A%2227455%22%2C%22myCity%22%3A%22%22%2C%22myState%22%3A%22%22%2C%22autoZip%22%3A%2260605%22%7D%2C%22tires%22%3A%7B%22main%22%3A%7B%22lvl%22%3A0%2C%22cs%22%3A%22%22%2C%22ar%22%3A%22%22%2C%22rs%22%3A%22%22%2C%22tireSize%22%3A%22%22%2C%22dt%22%3A%22%22%7D%2C%22tce%22%3A%7B%22lvl%22%3A0%2C%22cs%22%3A%22%22%2C%22ar%22%3A%22%22%2C%22rs%22%3A%22%22%2C%22tireSize%22%3A%22%22%2C%22dt%22%3A%22%22%7D%7D%7D%3Bipe.34220.pageViewedCount%3D6%3Bipe_34220_fov%3D%7B%22numberOfVisits%22%3A2%2C%22sessionId%22%3A%22844f4d31-5961-eefa-84bf-7968471b368b%22%2C%22expiry%22%3A%222021-04-04T10%3A51%3A26.168Z%22%2C%22lastVisit%22%3A%222021-03-08T08%3A12%3A59.243Z%22%7D; ipe.34220.pageViewedCount=6; ipe_34220_fov=%7B%22numberOfVisits%22%3A2%2C%22sessionId%22%3A%22844f4d31-5961-eefa-84bf-7968471b368b%22%2C%22expiry%22%3A%222021-04-04T10%3A51%3A26.168Z%22%2C%22lastVisit%22%3A%222021-03-08T08%3A12%3A59.243Z%22%7D; mbox=PC#4955e053c82748ffb20226c9b4f90b6b.31_0#1678437442|session#ad2cd5695ceb42e290928be3de398df5#1615192748; geoIP={"ip":"103.81.78.10","timestamp":1615192642239}; AMCV_AD455AA8591B70C90A495EA3%40AdobeOrg=359503849%7CMCIDTS%7C18695%7CMCMID%7C46604622306408834460545976289125483240%7CMCAAMLH-1615797442%7C12%7CMCAAMB-1615797442%7CRKhpRz8krg2tLO6pguXWp5olkAcUniQYPHaMWWgdJ3xzPWQmdj0y%7CMCOPTOUT-1615199842s%7CNONE%7CMCSYNCSOP%7C411-18699%7CMCCIDH%7C216794536%7CvVersion%7C5.0.1;_uetsid=5e36f1507fd811eb91d95f1487a3dd0d; _uetvid=a840a0807cd711ebb16f2d42ae695b73; s_sess=%20s_sq%3D%3B%20s_cc%3Dtrue%3B%20s_ppvl%3D404%25253Ahttps%25253A%252F%252Fix-dev.devicecaresystem.com%252Fbsro%252Fservices%252Fheavy-cookie%252C38%252C38%252C414%252C1536%252C414%252C1536%252C864%252C1.25%252CP%3B%20s_ppv%3D404%25253Ahttps%25253A%252F%252Fix-dev.devicecaresystem.com%252Fbsro%252Fservices%252Fheavy-cookie%252C38%252C38%252C414%252C1536%252C330%252C1536%252C864%252C1.25%252CP%3B; s_pers=%20s_vnum%3D1622717469965%2526vn%253D6%7C1622717469965%3B%20s_invisit%3Dtrue%7C1615204800559%3B%20last_v%3D1615203000568%7C1709811000568%3B%20last_v_s%3DLess%2520than%25201%2520day%7C1615204800568%3B%20gpv%3D404%253Ahttps%253A%252F%252Fix-dev.devicecaresystem.com%252Fbsro%252Fservices%252Fheavy-cookie%7C1615204800576%3B%20s_nr%3D1615203000580-Repeat%7C1646739000580%3B%20s_depth%3D1%7C1615204800586%3B

没有 http_req_hdr_len 升级，我遇到了与您收到的相同的 HTTP/400 错误。升级后我遇到 HTTP/431 Request Header Fields Too Large 错误。

我假设还有另一个设置需要调整，但我得出的结论是这个 HTTP/431 错误来自我的后端服务器，而不是来自 Varnish。

然后我创建了以下 VCL 片段来执行显示 cookie 的合成响应

vcl 4.1;

backend default none;

sub vcl_recv {
    return(synth(200));
}

sub vcl_synth {
   set resp.http.Content-Type = "text/plain";
   set resp.body = req.http.Cookie;
   set resp.reason = "OK";
   return(deliver);
}

结果 synth 显示了完整的 cookie，这让我得出结论，将 http_req_hdr_len 设置为足够高的值将解决问题。

Answer 2

我的问题是在 haproxy 级别。在 haproxy 中将缓冲区大小设置为特定级别（> 16KB）后，请求现在到达清漆。我接受了 Thijs 的回答，因为它帮助我得出结论，请求没有到达清漆本身。

Varnish http_req_hdr_len 参数不适用于请求 header 大小 > 8KB

Varnish http_req_hdr_len parameter not working for request header size > 8KB

varnish

varnish-vcl

varnish-4

Header 尺码

工作区设置

测试您的长 cookie 用例