What reasons would rel=preload followed by a fetch of same resource return an incomplete response body?












0















I am trying to preload a binary asset to get it discovered by the browser earlier and hopefully speed up the rendering of that asset once the application is up and running.



Usually we're fetching that asset with a normal fetch and then reading there that response.



The problem I am facing is, once I add a <link rel="preload" as="fetch" href="my-asset-url" crossorigin="anonymous" /> things start getting weird.



The behavior I am seeing is that the browser is successfully discovering the asset early and preloads it correctly.



Then when the fetch in the app code executes (there is no network request going out - which what I would expect since it already preloaded it), the response for that fetch, however, is incomplete - it's returning a partial of what the response is expected (32,768 bytes - consistently out of 393,372 bytes).



I am unable to reproduce this behavior outside of our app code so far. But thought I'd ask to see if anyone might have seen similar behavior like this. Any idea what could cause this?










share|improve this question



























    0















    I am trying to preload a binary asset to get it discovered by the browser earlier and hopefully speed up the rendering of that asset once the application is up and running.



    Usually we're fetching that asset with a normal fetch and then reading there that response.



    The problem I am facing is, once I add a <link rel="preload" as="fetch" href="my-asset-url" crossorigin="anonymous" /> things start getting weird.



    The behavior I am seeing is that the browser is successfully discovering the asset early and preloads it correctly.



    Then when the fetch in the app code executes (there is no network request going out - which what I would expect since it already preloaded it), the response for that fetch, however, is incomplete - it's returning a partial of what the response is expected (32,768 bytes - consistently out of 393,372 bytes).



    I am unable to reproduce this behavior outside of our app code so far. But thought I'd ask to see if anyone might have seen similar behavior like this. Any idea what could cause this?










    share|improve this question

























      0












      0








      0


      0






      I am trying to preload a binary asset to get it discovered by the browser earlier and hopefully speed up the rendering of that asset once the application is up and running.



      Usually we're fetching that asset with a normal fetch and then reading there that response.



      The problem I am facing is, once I add a <link rel="preload" as="fetch" href="my-asset-url" crossorigin="anonymous" /> things start getting weird.



      The behavior I am seeing is that the browser is successfully discovering the asset early and preloads it correctly.



      Then when the fetch in the app code executes (there is no network request going out - which what I would expect since it already preloaded it), the response for that fetch, however, is incomplete - it's returning a partial of what the response is expected (32,768 bytes - consistently out of 393,372 bytes).



      I am unable to reproduce this behavior outside of our app code so far. But thought I'd ask to see if anyone might have seen similar behavior like this. Any idea what could cause this?










      share|improve this question














      I am trying to preload a binary asset to get it discovered by the browser earlier and hopefully speed up the rendering of that asset once the application is up and running.



      Usually we're fetching that asset with a normal fetch and then reading there that response.



      The problem I am facing is, once I add a <link rel="preload" as="fetch" href="my-asset-url" crossorigin="anonymous" /> things start getting weird.



      The behavior I am seeing is that the browser is successfully discovering the asset early and preloads it correctly.



      Then when the fetch in the app code executes (there is no network request going out - which what I would expect since it already preloaded it), the response for that fetch, however, is incomplete - it's returning a partial of what the response is expected (32,768 bytes - consistently out of 393,372 bytes).



      I am unable to reproduce this behavior outside of our app code so far. But thought I'd ask to see if anyone might have seen similar behavior like this. Any idea what could cause this?







      javascript web fetch preload






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 21 '18 at 21:29









      mkhatibmkhatib

      3,27012033




      3,27012033
























          0






          active

          oldest

          votes











          Your Answer






          StackExchange.ifUsing("editor", function () {
          StackExchange.using("externalEditor", function () {
          StackExchange.using("snippets", function () {
          StackExchange.snippets.init();
          });
          });
          }, "code-snippets");

          StackExchange.ready(function() {
          var channelOptions = {
          tags: "".split(" "),
          id: "1"
          };
          initTagRenderer("".split(" "), "".split(" "), channelOptions);

          StackExchange.using("externalEditor", function() {
          // Have to fire editor after snippets, if snippets enabled
          if (StackExchange.settings.snippets.snippetsEnabled) {
          StackExchange.using("snippets", function() {
          createEditor();
          });
          }
          else {
          createEditor();
          }
          });

          function createEditor() {
          StackExchange.prepareEditor({
          heartbeatType: 'answer',
          autoActivateHeartbeat: false,
          convertImagesToLinks: true,
          noModals: true,
          showLowRepImageUploadWarning: true,
          reputationToPostImages: 10,
          bindNavPrevention: true,
          postfix: "",
          imageUploader: {
          brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
          contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
          allowUrls: true
          },
          onDemand: true,
          discardSelector: ".discard-answer"
          ,immediatelyShowMarkdownHelp:true
          });


          }
          });














          draft saved

          draft discarded


















          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53420719%2fwhat-reasons-would-rel-preload-followed-by-a-fetch-of-same-resource-return-an-in%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown

























          0






          active

          oldest

          votes








          0






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes
















          draft saved

          draft discarded




















































          Thanks for contributing an answer to Stack Overflow!


          • Please be sure to answer the question. Provide details and share your research!

          But avoid



          • Asking for help, clarification, or responding to other answers.

          • Making statements based on opinion; back them up with references or personal experience.


          To learn more, see our tips on writing great answers.




          draft saved


          draft discarded














          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53420719%2fwhat-reasons-would-rel-preload-followed-by-a-fetch-of-same-resource-return-an-in%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown





















































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown

































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown







          Popular posts from this blog

          Paul Cézanne

          UIScrollView CustomStickyHeader Resize height generates problems when scroll is too fast

          Angular material date-picker (MatDatepicker) auto completes the date on focus out