JavaScript ES6 Fetch API時(shí)需要注意的一個(gè)Cookie問(wèn)題是怎樣的，相信很多沒(méi)有經(jīng)驗(yàn)的人對(duì)此束手無(wú)策，為此本文總結(jié)了問(wèn)題出現(xiàn)的原因和解決方法，通過(guò)這篇文章希望你能解決這個(gè)問(wèn)題。

創(chuàng)新互聯(lián)公司網(wǎng)站建設(shè)公司，提供成都網(wǎng)站建設(shè)、做網(wǎng)站，網(wǎng)頁(yè)設(shè)計(jì)，建網(wǎng)站，PHP網(wǎng)站建設(shè)等專(zhuān)業(yè)做網(wǎng)站服務(wù);可快速的進(jìn)行網(wǎng)站開(kāi)發(fā)網(wǎng)頁(yè)制作和功能擴(kuò)展；專(zhuān)業(yè)做搜索引擎喜愛(ài)的網(wǎng)站，是專(zhuān)業(yè)的做網(wǎng)站團(tuán)隊(duì)，希望更多企業(yè)前來(lái)合作!

When I am doing a test of comparison between Stateful and Stateless BSP application ( mentioned in blog  Stateless and Stateful – Different behavior in application side ), I meet with a strange issue.

The conclusion is stateful BSP application will handle request sequentially. Suppose in client I send two request A and B to server. Request A takes 3 seconds to finish and B 2 seconds.

The request is sent via jQuery API. It means for stateful application, I will observe the following timeline in Chrome network tab:

(1) the start time of both request are almost the same, since I send out two request in client code almost at the same time. (2) even though the second request itself takes 2 seconds to finish, the total processing time for it is 3 seconds waiting for A to finish first + 2 seconds = 5 seconds in the end.

The above test did verify the conclusion. However when I change the approach to send request into ES6 fetch API,

<%@page language="abap" %><%@extension name="htmlb" prefix="htmlb" %>Fire two request

the testing request for stateful application looks as below this time:

The two requests are handled simultaneously ( request B only takes 2 seconds to finish, no 3 seconds’ wait time for A to finish this time ), the response of second request returns first before the first, which could be observed in console:

why the latest ES6 API causes such discrepancy with known conclusion? Just compare the cookie of requests sent via these two kinds of API:

Through comparison I get to know that the session cookie sap-contextid is not sent together with request triggered by ES6 Fetch API. Then in  Fetch documentation I find out that I need to add option credentials: “include”.

function wrapperOnFetch(url){
 // enable session cookie sent with request  fetch(url,{ credentials:"include" }).then(function(response){
    return response.json();
  }).then(function(json){
      console.log(url + ":" + json.message);
  });}

After this change the stateful BSP application behaves as expected: the requests are handled in sequence.

看完上述內(nèi)容，你們掌握J(rèn)avaScript ES6 Fetch API時(shí)需要注意的一個(gè)Cookie問(wèn)題是怎樣的的方法了嗎？如果還想學(xué)到更多技能或想了解更多相關(guān)內(nèi)容，歡迎關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道，感謝各位的閱讀！