使用“If-None-Match”标题创建HttpWebRequest（Etag） [英] Making HttpWebRequest with “If-None-Match” Header (Etag)
本文介绍了使用“If-None-Match”标题创建HttpWebRequest（Etag）的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试使用normall从网上下载数据httpwebrequest（适用于大多数网址），但服务器发送意外回复，如此
HTTP / 1.1 200 OK
服务器：nginx
日期：星期四，2017年8月10日03:59:39 GMT
内容类型：application / json
内容长度：1984
连接：keep-alive
访问-Control-Allow-Headers：Content-Type，Authorization，X-Requested-With，X-CSRFToken，If-None-Match-，X-API-SOURCE
Vary：Accept-Encoding，Cookie
ETag："6f15f338d170c7f833c491beb546e4a9; gzip"
Access-Control-Allow-Credentials：true
Access-Control-Allow-Methods：POST，GET，OPTIONS，PUT，DELETE
Set-Cookie：SPC_SI = ycl079eb0umjw270xoybjhok3hz6hp7x; expires =星期五，2017年8月11日03:59:39 GMT;仅Http;最大年龄= 86400; Path = /
{
" itemid"：62790979，
" likes"：false，
" ; offer_count" ;: 0，
"影片] ;: []，
" rating_star" ;: 5.187136305269734，
"图像" ;:" 6ebb860db6 ????????? ????????????,,
" image_list"：[" 6ebb860db6 ????????????????????? ;]，
" is_adult"：null，
" can_use_wholesale"：false，
" currency"：" IDR"，
" rcount_with_context"：6，
" show_free_shipping"：1，
" estimated_days"：3，
" show_discount"：0，
" price_before_discount"：0，
" cmt_count" ;: 16，
" is_shopee_verified" ;:假，
" CATID" ;: 202，
" is_official_shop" ;:假，
" ; price_min"：null，
" rating_count"：[10,0,0,2,3,5]，
" likes_count"：13，
" version"：" ; 6f15f338d170c7f833c491beb546e4a9"，
" coin_earn_items"：[]，
" price_min_before_discount"：0，
" cb_option"：0，
" price"：null，
" hashtag_list"：[
" #editin ????????????????,,
" #soft ????????? ??"，
" #sof ??????????,,
" #pal ?????????，
" #pal ?????????,,
" #co ??????"，
" #co ???????，"，
" #prog ???????????,,
" #juals ?????????????,,
" #ins ????????"，
" #fl ??????"，
"＃??"，
" #pal ?? ??????"，"
" #U ????"
]，
" price_max"：null，
" description"：" Corel Draw Video X9 32& 64位\ nn2。友立会声会影v11 Plus \\\
3。友立会声会影v11 Plus \\\
4。索尼Ve ????????????????????????????????? ?????????????????????????????????????????????????? ?????????????????????????????????????????????????? ?????????????????????????????????????????????????? ?????????????????????????????????????????????????? ?????????????????????????????????????????????????? ?????????????????????????????????????????????????? ?????????????????????????????????????????????????" ;，
" flash_sale" ;:空，
"模型" ;: []，
"品牌" ;:"" ;,
" rcount_with_image" ;: 1，
" shopid"：3732962，
" discount"：null，
" has_lowest_price_guarantee"：false，
" sold"：4，
" price_max_before_discount"：0，
" sub_catid"：443，
" condition"：1，
" name"：" Packet ???????????? ????????????，"
"批发_tier_list" ;: []，
" ITEM_STATUS" ;: [否????" ;,
" third_catid" ;: 6910，
" is_pre_order" ;:假，
" coin_spend_cash_unit"：null，
" attributes"：[]，
" stock"：118
}
正如你所看到的，有些字段与恼人的" 结合在一起？ "
我使用Fidler检查标准浏览器请求，与我的请求唯一不同的是浏览器发送" If-None-Match - " header
到服务器。问题是如何填充该标题，因为我尝试从之前的请求发送etag标题但我仍然得到响应" ？ "
characters。
这是我的请求代码
<预类=" prettyprint"> HttpWebRequest的网络;
HttpWebResponse RESP;
的StreamReader阅读器;
Web =（HttpWebRequest）WebRequest.Create（"" https：//shopee.co.id/api/v1/item_detail/？item_id = 262740376& shop_id = 13072340"）;
Web.CookieContainer = New CookieContainer（）;
Web.Method =" GET";
Web.UserAgent =" Mozilla / 5.0（Windows NT 10.0; Win64; x64）AppleWebKit / 537.36（KHTML，与Gecko一样）铬/ 42.0.2311.135 Safari浏览器/ 537.36边沿/ 12.10240英寸;
Web.KeepAlive = TRUE;
Web.Accept = QUOT;应用/ JSON英寸;
Web.ContentType = QUOT;应用/ json; Charset = UTF-8" ;;
Web.CachePolicy = new HttpRequestCachePolicy（HttpRequestCacheLevel.CacheIfAvailable）;
Web.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
Web.Headers。添加（"x-requested-with"，"XMLHttpRequest"） ;
Web.Headers.Add（" x-api-source"，" pc"）;
Resp =（HttpWebResponse）Web.GetResponse（）;
Reader = new StreamReader（Resp.GetResponseStream（））;
string Res = Reader.ReadToEnd（）;
此代码适用于第一个5/6请求。之后，服务器将发送恼人的" ？ "
如上所述。
希望你能理解我糟糕的语言。
解决方案
有人请吗？
I am trying do download data from web with normall httpwebrequest (work on most url), but server send me unexpected response, like this
HTTP/1.1 200 OK Server: nginx Date: Thu, 10 Aug 2017 03:59:39 GMT Content-Type: application/json Content-Length: 1984 Connection: keep-alive Access-Control-Allow-Headers: Content-Type,Authorization,X-Requested-With,X-CSRFToken,If-None-Match-,X-API-SOURCE Vary: Accept-Encoding, Cookie ETag: "6f15f338d170c7f833c491beb546e4a9;gzip" Access-Control-Allow-Credentials: true Access-Control-Allow-Methods: POST,GET,OPTIONS,PUT,DELETE Set-Cookie: SPC_SI=ycl079eb0umjw270xoybjhok3hz6hp7x; expires=Fri, 11-Aug-2017 03:59:39 GMT; httponly; Max-Age=86400; Path=/
{
"itemid": 62790979,
"liked": false,
"offer_count": 0,
"videos": [],
"rating_star": 5.187136305269734,
"image": "6ebb860db6?????????????????????",
"image_list": ["6ebb860db6?????????????????????"],
"is_adult": null,
"can_use_wholesale": false,
"currency": "IDR",
"rcount_with_context": 6,
"show_free_shipping": 1,
"estimated_days": 3,
"show_discount": 0,
"price_before_discount": 0,
"cmt_count": 16,
"is_shopee_verified": false,
"catid": 202,
"is_official_shop": false,
"price_min": null,
"rating_count": [10, 0, 0, 2, 3, 5],
"liked_count": 13,
"version": "6f15f338d170c7f833c491beb546e4a9",
"coin_earn_items": [],
"price_min_before_discount": 0,
"cb_option": 0,
"price": null,
"hashtag_list": [
"#editin??????????????",
"#soft??????????",
"#sof?????????",
"#pal????????",
"#pal????????",
"#co??????",
"#co???????",
"#prog??????????",
"#juals????????????",
"#ins????????",
"#fl??????",
"#??",
"#pal????????",
"#u????"
],
"price_max": null,
"description": "Corel Draw Video X9 32 & 64 Bit\n2. Ulead VideoStudio v11 Plus\n3. Ulead VideoStudio v11 Plus\n4. Sony Ve?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????",
"flash_sale": null,
"models": [],
"brand": "",
"rcount_with_image": 1,
"shopid": 3732962,
"discount": null,
"has_lowest_price_guarantee": false,
"sold": 4,
"price_max_before_discount": 0,
"sub_catid": 443,
"condition": 1,
"name": "Packet????????????????????????",
"wholesale_tier_list": [],
"item_status": "no????",
"third_catid": 6910,
"is_pre_order": false,
"coin_spend_cash_unit": null,
"attributes": [],
"stock": 118
}
as you can see, some fields is combined with annoying "?"
I check standar browser request using Fidler, the only thing different from my request is browser send "If-None-Match-" header
to the server. question is how to fill that header, because I tried sent etag header from previous request but i still get response with "?"
characters.
This is my request code
HttpWebRequest Web;
HttpWebResponse Resp;
StreamReader Reader;
Web = (HttpWebRequest)WebRequest.Create(""https://shopee.co.id/api/v1/item_detail/?item_id=262740376&shop_id=13072340");
Web.CookieContainer = New CookieContainer();
Web.Method = "GET";
Web.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36 Edge/12.10240";
Web.KeepAlive = true;
Web.Accept = "application/json";
Web.ContentType = "application/json; Charset=UTF-8";
Web.CachePolicy = new HttpRequestCachePolicy(HttpRequestCacheLevel.CacheIfAvailable);
Web.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
Web.Headers.Add("x-requested-with", "XMLHttpRequest");
Web.Headers.Add("x-api-source", "pc");
Resp = (HttpWebResponse)Web.GetResponse();
Reader = new StreamReader(Resp.GetResponseStream());
string Res = Reader.ReadToEnd();
this code work for first 5/6 request. after that, server will send annoying "?"
like above.
Hope you understand my poor language.
解决方案
anyone please?
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