https://yokekeong.com/blog/httr/Recent content in Httr on Yoke KeongHugoenTue, 10 Mar 2015 11:00:52 +0000https://yokekeong.com/download-files-over-https-in-r-with-httr/Tue, 10 Mar 2015 11:00:52 +0000https://yokekeong.com/download-files-over-https-in-r-with-httr/<p>To download a file over HTTP connection, we normally use <code>download.file</code> command in R, for example:</p> <div class="highlight"><pre tabindex="0" style="color:#d8dee9;background-color:#2e3440;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-r" data-lang="r"><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#6c6f74">1</span><span>url <span style="color:#81a1c1">=</span> <span style="color:#a3be8c">&#34;http://vincentarelbundock.github.io/Rdatasets/csv/datasets/iris.csv&#34;</span> </span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#6c6f74">2</span><span><span style="color:#88c0d0">download.file</span><span style="color:#eceff4">(</span>url<span style="color:#eceff4">,</span> <span style="color:#a3be8c">&#34;iris.csv&#34;</span><span style="color:#eceff4">,</span> quiet<span style="color:#81a1c1">=</span><span style="color:#81a1c1;font-weight:bold">TRUE</span><span style="color:#eceff4">)</span> </span></span></code></pre></div><p>For HTTPS connections, <code>download.file</code> may give you some issues. In situations like this you can consider using the <a href="http://cran.r-project.org/web/packages/httr/index.html">httr</a> package to download files:</p> <div class="highlight"><pre tabindex="0" style="color:#d8dee9;background-color:#2e3440;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-r" data-lang="r"><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#6c6f74">1</span><span><span style="color:#88c0d0">library</span><span style="color:#eceff4">(</span>httr<span style="color:#eceff4">)</span> </span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#6c6f74">2</span><span>url <span style="color:#81a1c1">&lt;-</span> <span style="color:#a3be8c">&#34;https://rawgit.com/yoke2/dsxref/master/iris.xlsx&#34;</span> </span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#6c6f74">3</span><span><span style="color:#88c0d0">GET</span><span style="color:#eceff4">(</span>url<span style="color:#eceff4">,</span> <span style="color:#88c0d0">write_disk</span><span style="color:#eceff4">(</span><span style="color:#a3be8c">&#34;iris.xlsx&#34;</span><span style="color:#eceff4">,</span> overwrite<span style="color:#81a1c1">=</span><span style="color:#81a1c1;font-weight:bold">TRUE</span><span style="color:#eceff4">))</span> </span></span></code></pre></div>