JavaScript ES6 Fetch API时需要注意的一个Cookie问题是怎样的，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。

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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.

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