Re: [whatwg/fetch] Uploading a Request made from a ReadableStream body (#425)

@BingyuLiu commented on this pull request.



> +  <ol>
+   <li><p>Set <var>httpRequest</var> to a copy of <var>request</var> except for its
+   <a for=request>body</a>.
+
+   <li><p>Let <var>body</var> be <var>request</var>'s <a for=request>body</a>.
+
+   <li><p>Set <var>httpRequest</var>'s <a for=request>body</a> to <var>body</var>.
+
+   <li><p>If <var>body</var> is non-null, then set <var>request</var>'s <a for=request>body</a> to a
+   new <a for=/>body</a> whose <a for=body>stream</a> is null and whose <a for=body>source</a> is
+   <var>body</var>'s <a for=body>source</a>.
+  </ol>
+
+  <p class="note no-backref">Here we do not <a for=request>clone</a> <var>request</var> in order
+  to reduce memory consumption. <var>request</var> can be reused with redirects, authentication,
+  and proxy authentication.

Fetch post-call Always return 415 ？？？？？？？？？？WHY

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