title: rvest html() not recognizing URLs
body: <p>So I'm writing a web scraper with R to search zillow for the median house value in each county in WA state. I'm using the rvest package, and here is the code in question:</p>
  
  <pre><code>URL &lt;- "https://en.wikipedia.org/wiki/List_of_counties_in_Washington"
  wiki &lt;- html(URL)
  
  #Getting the list of counties in WA
  counties &lt;- wiki %&gt;%
    html_nodes(".wikitable td:nth-child(1) a") %&gt;%
    html_text()
  
  #Putting together a list to pull my search terms from
  searchTerms &lt;- list()
  
  for(i in 1:length(counties)) {
    searchTerms[[i]] &lt;- paste0(counties[i], ", WA", sep="")
  }
  searchTerms &lt;- gsub(",", "", searchTerms)
  searchTerms &lt;- gsub(" ", "-", searchTerms)
  
  homeValues &lt;- list()
  
  #Getting the HTML for each county using the search terms in the URL,
  #eventually it will pull the homeValues data from that HTML.
  for(j in 1:length(searchTerms)){
    zillowURL &lt;- paste0("www.zillow.com/", searchTerms[j], "/home-values/", sep="")
    zillowHTML &lt;- html(zillowURL)
  
  }
  </code></pre>
  
  <p>I'm not finished yet, of course, but when I run this code, I get the error message </p>
  
  <blockquote>
    <p>"Error: File <a href="http://www.zillow.com/Adams-County-WA/home-values/" rel="nofollow">www.zillow.com/Adams-County-WA/home-values/</a> does not
    exist"</p>
  </blockquote>
  
  <p>, with Adams County, WA being the first alphabetical county in WA state. My guess is that this has something to do with how Zillow's website works? When I go to the above URL in my browser it works fine.</p>