http - Varnish 抛出 503 - 'http format error' 以获得 301 后端响应

Question

我向我的后端发出请求，例如:

curl 'www.epocacosmeticos.com.br/api/vtexid/pub/authentication/oauth/redirect?authenticationToken=dbaf4496-a35f-4393-b2aa-66c633cd91cc&providerName=Google' -H 'Accept-Encoding: gzip,deflate,sdch' -H 'Accept-Language: pt-BR,pt;q=0.8,en-US;q=0.6,en;q=0.4' -H 'User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1700.107 Safari/537.36' -H 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8' -H 'Referer: http://www.epocacosmeticos.com.br/login?ReturnUrl=%2faccount%2forders' -H 'Cookie: ISSMB=ScreenMedia%3d0%26UserAcceptMobile%3dFalse; VtexRCMacIdv7=81ee3f61-9b15-11e3-b4b2-9f1bfd993f63; VtexRCRequestCounter=1; VtexRCSessionIdv7=1%253A81ee1850-9b15-11e3-b4b2-9f1bfd993f63; _ga=GA1.3.138072997.1393000243; __utma=226091982.138072997.1393000243.1393000244.1393000244.1; __utmb=226091982.2.9.1393000244; __utmc=226091982; __utmz=226091982.1393000244.1.1.utmcsr%3d(direct)%7cutmccn%3d(direct)%7cutmcmd%3d(none); __bid=82ba78fa-9b15-11e3-855b-0050568438b8-1393000243982-99785454268; __vnr=1; __butms=e69.; __cip=eyJ7bmR%2526%2524m%2526%253B%2524WQi-n%253AiaS!3!nV%253B%2524GVmaW4%2526%2524CJ1fQ..; __pnr=1; __vid=82ba78fa-9b15-11e3-855b-0050568438b8-1393000243982-99785454268; __uor=http%253A%252F%252Fwww.epocacosmeticos.com.br%252F; SGTS=IndiceSegmentoHashCookie%3d1045D4DA0B960F9A25D39084CD6025D6; checkout.vtex.com=__ofid%3d1690a434781a438484df3bb6a15185ce; .ASPXAUTH=85FF63271A0620AB22B47E562CB09392DE69480960F7C4E446BF49E398D71C6D8C07700086D64F79764C020DC9D7DF3157F2940D885A580A107319AF1AC4693EB049F22010F4730A9C383077CF78F35E2E67F8848F7AF30603D68E7460197F92F3AC39A9F56E9F50E7C4DBEC682B44F57AFD11BB23D58FB0028858B4328527D27EC66EA288EFC325195CF865FDC8F77301F066817B185751A2F0E34FF7A6808D03C53EB2688BEA6BDD15EE4DBC41A5D2C0C14E6A9E81130C3DB4400B95F968E952165853; nav22278=9173723934_121; i18next=pt-BR; ISSMB=ScreenMedia=0&UserAcceptMobile=False; nav22278=9173723934_121; .ASPXAUTH=54B8EBA0CEA119D0480D20FB8F08F9BDB895EA7910195E0EB55DFCF1FF94CC1096CC536152930FB06F0CE302BE04159E54BD87E4896D8028C0224E5EBFA9EF28056A32056A7F03D5F374E6FC507D4C9EFA03238D95C763BC6322436857C865B2BF27DC19FE4B63099D1DC2C5A2FBFF04F16D6F2D093340CE3BF7AD3EFAC11589FFD02BDD2D88695BE0D088EFA82EFA8A89DE72AD5376AD8EF05043A5D73F5E8473D60A1230B70ACC5B0FD8A6EF0D50038E1D8C15A450181B720A5F10D17A8CA3438BDC7B; __bid=e2ccd23c-9b1b-11e3-8cca-0050568438b8-1393002980892-20482039195; __vnr=1; SGTS=IndiceSegmentoHashCookie=1045D4DA0B960F9A25D39084CD6025D6; VtexRCSessionIdv7=1%3A4ff8f970-9b2c-11e3-9972-21a9f9abb2ac; VtexRCMacIdv7=e0d1b970-9b1b-11e3-9aa8-21696aee4194; VtexRCRequestCounter=4; _ga=GA1.3.1993338433.1393002979; __utma=226091982.1993338433.1393002979.1393002981.1393010038.2; __utmb=226091982.8.9.1393010047697; __utmc=226091982; __utmz=226091982.1393002981.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); __butms=e69.; __pnr=1; __vid=e2ccd23c-9b1b-11e3-8cca-0050568438b8-1393002980892-20482039195; __uor=http%3A%2F%2Fwww.epocacosmeticos.com.br%2Fthat-girl; __cip=eyJ7bmR%26%24m%26%3B%24WQi-n%3AiaS!3!nV%3B%24GVmaW4%26%24CJ1fQ..; checkout.vtex.com=__ofid=7f8daa695f154f8e8e3c4fe7cf132124; i18next=pt-BR' -H 'Connection: keep-alive' -H 'Cache-Control: max-age=0' --compressed --verbose

然后我得到这个响应(连同其他“set-cookie”):

Connection: keep-alive

Cache-Control: max-age=0

HTTP/1.1 301 Moved Permanently

Access-Control-Allow-Headers: Origin, X-Requested-With,

Content-Type, Accept Access-Control-Allow-Origin: *

Cache-Control: no-cache

Date: Fri, 21 Feb 2014 19:23:17 GMT

Expires: -1

Location: https://accounts.google.com/o/oauth2/auth?client_id=544793639791-flepceudig4p3n1h3m17o8bv9hqn8677.apps.googleusercontent.com&redirect_uri=https%3a%2f%2fvtexid.vtex.com.br%2fVtexIdAuthSiteKnockout%2fReceiveAuthorizationCode.ashx&scope=https%3a%2f%2fwww.googleapis.com%2fauth%2fuserinfo.profile+https%3a%2f%2fwww.googleapis.com%2fauth%2fuserinfo.email&access_type=offline&response_type=code&state=a63c683e-7986-4fd9-a89a-dce70da3e4f9

Pragma: no-cache

Server: Microsoft-IIS/8.0

Server: Microsoft-IIS/8.0

Content-Length: 0

Connection: keep-alive

现在我将 DNS 指向 varnish 的一个新副本，由 VCL(上面那个)上的单个后端定义。相同的请求使 varnish 抛出 503:

Connection: keep-alive

Cache-Control: max-age=0

HTTP/1.1 503 Service Unavailable

Server: Varnish

Content-Type: text/html; charset=utf-8

Retry-After: 5

Content-Length: 419

Accept-Ranges: bytes

Date: Fri, 21 Feb 2014 19:43:11 GMT

X-Varnish: 1045156151

Age: 0

Via: 1.1 varnish

Connection: close

在 varnishlog 上我看到了这个:

11 SessionOpen c 127.0.0.1 59882 :80

11 ReqStart c 127.0.0.1 59882 1045156151

11 RxRequest c GET

11 RxURL c /api/vtexid/pub/authentication/oauth/redirect?authenticationToken=e0f98a75-5f82-41c3-8951-bbc51076ea3f&providerName=Google

11 RxProtocol c HTTP/1.1

11 RxHeader c Host: www.epocacosmeticos.com.br

11 RxHeader c Accept-Encoding: gzip,deflate,sdch

11 RxHeader c Accept-Language: pt-BR,pt;q=0.8,en-US;q=0.6,en;q=0.4

11 RxHeader c User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1700.107 Safari/537.36

11 RxHeader c Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,/;q=0.8

11 RxHeader c Referer: http://www.epocacosmeticos.com.br/login?ReturnUrl=%2faccount%2forders

11 RxHeader c Cookie: ISSMB=ScreenMedia%3d0%26UserAcceptMobile%3dFalse; VtexRCMacIdv7=81ee3f61-9b15-11e3-b4b2-9f1bfd993f63; VtexRCRequestCounter=1; VtexRCSessionIdv7=1%253A81ee1850-9b15-11e3-b4b2-9f1bfd993f63; _ga=GA1.3.138072997.1393000243; __utma=226091982.138072997. 11 RxHeader c Connection: keep-alive

11 RxHeader c Cache-Control: max-age=0

11 VCL_call c recv pass

11 VCL_call c hash

11 Hash c /api/vtexid/pub/authentication/oauth/redirect?authenticationToken=e0f98a75-5f82-41c3-8951-bbc51076ea3f&providerName=Google

11 Hash c www.epocacosmeticos.com.br

11 VCL_return c hash

11 VCL_call c pass pass

11 Backend c 13 prodbackend prodbackend

11 FetchError c http format error

11 VCL_call c error deliver

11 VCL_call c deliver deliver

11 TxProtocol c HTTP/1.1

11 TxStatus c 503

11 TxResponse c Service Unavailable

11 TxHeader c Server: Varnish

11 TxHeader c Content-Type: text/html; charset=utf-8

11 TxHeader c Retry-After: 5

11 TxHeader c Content-Length: 419

11 TxHeader c Accept-Ranges: bytes

11 TxHeader c Date: Fri, 21 Feb 2014 19:43:11 GMT

11 TxHeader c X-Varnish: 1045156151

11 TxHeader c Age: 0

11 TxHeader c Via: 1.1 varnish

11 TxHeader c Connection: close

11 Length c 419

11 ReqEnd c 1045156151 1393011791.083344221 1393011791.505552292 0.000167608 0.422099590 0.000108480

11 SessionClose c error

11 StatSess c 127.0.0.1 59882 0 1 1 0 1 0 257 419

有人知道 Varnish 为什么决定抛出 503 吗？从后端获取时，似乎响应有一个“http 格式错误”......我必须修复后端响应的哪一部分以改善 Varnish 的心情？ (在 3.0.4 和 3.0.5 上测试)

Answer 1

varnish 上有一个配置限制了它在后端响应中可以接收的 header 数量:http_max_hdr

我已通过参数 -p http_max_hdr=128

将此限制增加到 128(默认值为 64)