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| -rw-r--r-- | docs/en/cowboy/2.0/guide/cookies/index.html | 281 |
1 files changed, 142 insertions, 139 deletions
diff --git a/docs/en/cowboy/2.0/guide/cookies/index.html b/docs/en/cowboy/2.0/guide/cookies/index.html index c81cc17c..fe40ca87 100644 --- a/docs/en/cowboy/2.0/guide/cookies/index.html +++ b/docs/en/cowboy/2.0/guide/cookies/index.html @@ -7,7 +7,7 @@ <meta name="description" content=""> <meta name="author" content="Loïc Hoguin based on a design from (Soft10) Pol Cámara"> - <meta name="generator" content="Hugo 0.17" /> + <meta name="generator" content="Hugo 0.26" /> <title>Nine Nines: Using cookies</title> @@ -67,150 +67,153 @@ <h1 class="lined-header"><span>Using cookies</span></h1> -<div class="paragraph"><p>Cookies are a mechanism allowing applications to maintain
-state on top of the stateless HTTP protocol.</p></div>
-<div class="paragraph"><p>Cookies are a name/value store where the names and values are
-stored in plain text. They expire either after a delay
-or when the browser closes. They can be configured on a
-specific domain name or path, and restricted to secure
-resources (sent or downloaded over HTTPS), or restricted
-to the server (disallowing access from client-side scripts).</p></div>
-<div class="paragraph"><p>Cookie names are de facto case sensitive.</p></div>
-<div class="paragraph"><p>Cookies are stored client-side and sent with every subsequent
-request that matches the domain and path for which they were
-stored, until they expire. This can create a non-negligible
-cost.</p></div>
-<div class="paragraph"><p>Cookies should not be considered secure. They are stored on
-the user’s computer in plain text, and can be read by any
-program. They can also be read by proxies when using clear
-connections. Always validate the value before using it,
-and never store any sensitive information inside it.</p></div>
-<div class="paragraph"><p>Cookies set by the server are only available in requests
-following the client reception of the response containing
-them.</p></div>
-<div class="paragraph"><p>Cookies may be sent repeatedly. This is often useful to
-update the expiration time and avoid losing a cookie.</p></div>
-<div class="sect1">
-<h2 id="_setting_cookies">Setting cookies</h2>
-<div class="sectionbody">
-<div class="paragraph"><p>By default cookies are defined for the duration of the session:</p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight 3.1.8
-by Lorenzo Bettini
-http://www.lorenzobettini.it
-http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="color: #009900">SessionID</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">generate_session_id</span></span>(),
-<span style="color: #009900">Req</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:set_resp_cookie</span></span>(<span style="color: #990000"><<</span><span style="color: #FF0000">"sessionid"</span><span style="color: #990000">>></span>, <span style="color: #009900">SessionID</span>, <span style="color: #009900">Req0</span>)<span style="color: #990000">.</span></tt></pre></div></div>
-<div class="paragraph"><p>They can also be set for a duration in seconds:</p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight 3.1.8
-by Lorenzo Bettini
-http://www.lorenzobettini.it
-http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="color: #009900">SessionID</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">generate_session_id</span></span>(),
-<span style="color: #009900">Req</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:set_resp_cookie</span></span>(<span style="color: #990000"><<</span><span style="color: #FF0000">"sessionid"</span><span style="color: #990000">>></span>, <span style="color: #009900">SessionID</span>, <span style="color: #009900">Req0</span>,
- #{<span style="color: #0000FF">max_age</span> <span style="color: #990000">=></span> <span style="color: #993399">3600</span>})<span style="color: #990000">.</span></tt></pre></div></div>
-<div class="paragraph"><p>To delete cookies, set <code>max_age</code> to 0:</p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight 3.1.8
-by Lorenzo Bettini
-http://www.lorenzobettini.it
-http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="color: #009900">SessionID</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">generate_session_id</span></span>(),
-<span style="color: #009900">Req</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:set_resp_cookie</span></span>(<span style="color: #990000"><<</span><span style="color: #FF0000">"sessionid"</span><span style="color: #990000">>></span>, <span style="color: #009900">SessionID</span>, <span style="color: #009900">Req0</span>,
- #{<span style="color: #0000FF">max_age</span> <span style="color: #990000">=></span> <span style="color: #993399">0</span>})<span style="color: #990000">.</span></tt></pre></div></div>
-<div class="paragraph"><p>To restrict cookies to a specific domain and path, the options
-of the same name can be used:</p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight 3.1.8
-by Lorenzo Bettini
-http://www.lorenzobettini.it
-http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="color: #009900">Req</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:set_resp_cookie</span></span>(<span style="color: #990000"><<</span><span style="color: #FF0000">"inaccount"</span><span style="color: #990000">>></span>, <span style="color: #990000"><<</span><span style="color: #FF0000">"1"</span><span style="color: #990000">>></span>, <span style="color: #009900">Req0</span>,
- #{<span style="color: #0000FF">domain</span> <span style="color: #990000">=></span> <span style="color: #FF0000">"my.example.org"</span>, <span style="color: #0000FF">path</span> <span style="color: #990000">=></span> <span style="color: #FF0000">"/account"</span>})<span style="color: #990000">.</span></tt></pre></div></div>
-<div class="paragraph"><p>Cookies will be sent with requests to this domain and all
-its subdomains, and to resources on this path or deeper
-in the path hierarchy.</p></div>
-<div class="paragraph"><p>To restrict cookies to secure channels (typically resources
-available over HTTPS):</p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight 3.1.8
-by Lorenzo Bettini
-http://www.lorenzobettini.it
-http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="color: #009900">SessionID</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">generate_session_id</span></span>(),
-<span style="color: #009900">Req</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:set_resp_cookie</span></span>(<span style="color: #990000"><<</span><span style="color: #FF0000">"sessionid"</span><span style="color: #990000">>></span>, <span style="color: #009900">SessionID</span>, <span style="color: #009900">Req0</span>,
- #{<span style="color: #0000FF">secure</span> <span style="color: #990000">=></span> <span style="color: #000080">true</span>})<span style="color: #990000">.</span></tt></pre></div></div>
-<div class="paragraph"><p>To prevent client-side scripts from accessing a cookie:</p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight 3.1.8
-by Lorenzo Bettini
-http://www.lorenzobettini.it
-http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="color: #009900">SessionID</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">generate_session_id</span></span>(),
-<span style="color: #009900">Req</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:set_resp_cookie</span></span>(<span style="color: #990000"><<</span><span style="color: #FF0000">"sessionid"</span><span style="color: #990000">>></span>, <span style="color: #009900">SessionID</span>, <span style="color: #009900">Req0</span>,
- #{<span style="color: #0000FF">http_only</span> <span style="color: #990000">=></span> <span style="color: #000080">true</span>})<span style="color: #990000">.</span></tt></pre></div></div>
-<div class="paragraph"><p>Cookies may also be set client-side, for example using
-Javascript.</p></div>
-</div>
-</div>
-<div class="sect1">
-<h2 id="_reading_cookies">Reading cookies</h2>
-<div class="sectionbody">
-<div class="paragraph"><p>The client only ever sends back the cookie name and value.
-All other options that can be set are never sent back.</p></div>
-<div class="paragraph"><p>Cowboy provides two functions for reading cookies. Both
-involve parsing the cookie header(s) and so should not
-be called repeatedly.</p></div>
-<div class="paragraph"><p>You can get all cookies as a key/value list:</p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight 3.1.8
-by Lorenzo Bettini
-http://www.lorenzobettini.it
-http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="color: #009900">Cookies</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:parse_cookies</span></span>(<span style="color: #009900">Req</span>),
-{<span style="color: #990000">_</span>, <span style="color: #009900">Lang</span>} <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">lists:keyfind</span></span>(<span style="color: #990000"><<</span><span style="color: #FF0000">"lang"</span><span style="color: #990000">>></span>, <span style="color: #993399">1</span>, <span style="color: #009900">Cookies</span>)<span style="color: #990000">.</span></tt></pre></div></div>
-<div class="paragraph"><p>Or you can perform a match against cookies and retrieve
-only the ones you need, while at the same time doing
-any required post processing using <a href="../constraints">constraints</a>.
-This function returns a map:</p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight 3.1.8
-by Lorenzo Bettini
-http://www.lorenzobettini.it
-http://www.gnu.org/software/src-highlite -->
-<pre><tt>#{<span style="color: #FF6600">id</span> <span style="color: #990000">:=</span> <span style="color: #009900">ID</span>, <span style="color: #FF6600">lang</span> <span style="color: #990000">:=</span> <span style="color: #009900">Lang</span>} <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:match_cookies</span></span>([<span style="color: #FF6600">id</span>, <span style="color: #FF6600">lang</span>], <span style="color: #009900">Req</span>)<span style="color: #990000">.</span></tt></pre></div></div>
-<div class="paragraph"><p>You can use constraints to validate the values while matching
-them. The following snippet will crash if the <code>id</code> cookie is
-not an integer number or if the <code>lang</code> cookie is empty. Additionally
-the <code>id</code> cookie value will be converted to an integer term:</p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight 3.1.8
-by Lorenzo Bettini
-http://www.lorenzobettini.it
-http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="color: #009900">CookiesMap</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:match_cookies</span></span>([{<span style="color: #FF6600">id</span>, <span style="color: #FF6600">int</span>}, {<span style="color: #FF6600">lang</span>, <span style="color: #FF6600">nonempty</span>}], <span style="color: #009900">Req</span>)<span style="color: #990000">.</span></tt></pre></div></div>
-<div class="paragraph"><p>Note that if two cookies share the same name, then the map value
-will be a list of the two cookie values.</p></div>
-<div class="paragraph"><p>A default value can be provided. The default will be used
-if the <code>lang</code> cookie is not found. It will not be used if
-the cookie is found but has an empty value:</p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight 3.1.8
-by Lorenzo Bettini
-http://www.lorenzobettini.it
-http://www.gnu.org/software/src-highlite -->
-<pre><tt>#{<span style="color: #FF6600">lang</span> <span style="color: #990000">:=</span> <span style="color: #009900">Lang</span>} <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:match_cookies</span></span>([{<span style="color: #FF6600">lang</span>, [], <span style="color: #990000"><<</span><span style="color: #FF0000">"en-US"</span><span style="color: #990000">>></span>}], <span style="color: #009900">Req</span>)<span style="color: #990000">.</span></tt></pre></div></div>
-<div class="paragraph"><p>If no default is provided and the value is missing, an
-exception is thrown.</p></div>
-</div>
-</div>
+<div class="paragraph"><p>Cookies are a mechanism allowing applications to maintain +state on top of the stateless HTTP protocol.</p></div> +<div class="paragraph"><p>Cookies are a name/value store where the names and values are +stored in plain text. They expire either after a delay +or when the browser closes. They can be configured on a +specific domain name or path, and restricted to secure +resources (sent or downloaded over HTTPS), or restricted +to the server (disallowing access from client-side scripts).</p></div> +<div class="paragraph"><p>Cookie names are de facto case sensitive.</p></div> +<div class="paragraph"><p>Cookies are stored client-side and sent with every subsequent +request that matches the domain and path for which they were +stored, until they expire. This can create a non-negligible +cost.</p></div> +<div class="paragraph"><p>Cookies should not be considered secure. They are stored on +the user’s computer in plain text, and can be read by any +program. They can also be read by proxies when using clear +connections. Always validate the value before using it, +and never store any sensitive information inside it.</p></div> +<div class="paragraph"><p>Cookies set by the server are only available in requests +following the client reception of the response containing +them.</p></div> +<div class="paragraph"><p>Cookies may be sent repeatedly. This is often useful to +update the expiration time and avoid losing a cookie.</p></div> +<div class="sect1"> +<h2 id="_setting_cookies">Setting cookies</h2> +<div class="sectionbody"> +<div class="paragraph"><p>By default cookies are defined for the duration of the session:</p></div> +<div class="listingblock"> +<div class="content"><!-- Generator: GNU source-highlight 3.1.8 +by Lorenzo Bettini +http://www.lorenzobettini.it +http://www.gnu.org/software/src-highlite --> +<pre><tt><span style="color: #009900">SessionID</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">generate_session_id</span></span>(), +<span style="color: #009900">Req</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:set_resp_cookie</span></span>(<span style="color: #990000"><<</span><span style="color: #FF0000">"sessionid"</span><span style="color: #990000">>></span>, <span style="color: #009900">SessionID</span>, <span style="color: #009900">Req0</span>)<span style="color: #990000">.</span></tt></pre></div></div> +<div class="paragraph"><p>They can also be set for a duration in seconds:</p></div> +<div class="listingblock"> +<div class="content"><!-- Generator: GNU source-highlight 3.1.8 +by Lorenzo Bettini +http://www.lorenzobettini.it +http://www.gnu.org/software/src-highlite --> +<pre><tt><span style="color: #009900">SessionID</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">generate_session_id</span></span>(), +<span style="color: #009900">Req</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:set_resp_cookie</span></span>(<span style="color: #990000"><<</span><span style="color: #FF0000">"sessionid"</span><span style="color: #990000">>></span>, <span style="color: #009900">SessionID</span>, <span style="color: #009900">Req0</span>, + #{<span style="color: #0000FF">max_age</span> <span style="color: #990000">=></span> <span style="color: #993399">3600</span>})<span style="color: #990000">.</span></tt></pre></div></div> +<div class="paragraph"><p>To delete cookies, set <code>max_age</code> to 0:</p></div> +<div class="listingblock"> +<div class="content"><!-- Generator: GNU source-highlight 3.1.8 +by Lorenzo Bettini +http://www.lorenzobettini.it +http://www.gnu.org/software/src-highlite --> +<pre><tt><span style="color: #009900">SessionID</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">generate_session_id</span></span>(), +<span style="color: #009900">Req</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:set_resp_cookie</span></span>(<span style="color: #990000"><<</span><span style="color: #FF0000">"sessionid"</span><span style="color: #990000">>></span>, <span style="color: #009900">SessionID</span>, <span style="color: #009900">Req0</span>, + #{<span style="color: #0000FF">max_age</span> <span style="color: #990000">=></span> <span style="color: #993399">0</span>})<span style="color: #990000">.</span></tt></pre></div></div> +<div class="paragraph"><p>To restrict cookies to a specific domain and path, the options +of the same name can be used:</p></div> +<div class="listingblock"> +<div class="content"><!-- Generator: GNU source-highlight 3.1.8 +by Lorenzo Bettini +http://www.lorenzobettini.it +http://www.gnu.org/software/src-highlite --> +<pre><tt><span style="color: #009900">Req</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:set_resp_cookie</span></span>(<span style="color: #990000"><<</span><span style="color: #FF0000">"inaccount"</span><span style="color: #990000">>></span>, <span style="color: #990000"><<</span><span style="color: #FF0000">"1"</span><span style="color: #990000">>></span>, <span style="color: #009900">Req0</span>, + #{<span style="color: #0000FF">domain</span> <span style="color: #990000">=></span> <span style="color: #FF0000">"my.example.org"</span>, <span style="color: #0000FF">path</span> <span style="color: #990000">=></span> <span style="color: #FF0000">"/account"</span>})<span style="color: #990000">.</span></tt></pre></div></div> +<div class="paragraph"><p>Cookies will be sent with requests to this domain and all +its subdomains, and to resources on this path or deeper +in the path hierarchy.</p></div> +<div class="paragraph"><p>To restrict cookies to secure channels (typically resources +available over HTTPS):</p></div> +<div class="listingblock"> +<div class="content"><!-- Generator: GNU source-highlight 3.1.8 +by Lorenzo Bettini +http://www.lorenzobettini.it +http://www.gnu.org/software/src-highlite --> +<pre><tt><span style="color: #009900">SessionID</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">generate_session_id</span></span>(), +<span style="color: #009900">Req</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:set_resp_cookie</span></span>(<span style="color: #990000"><<</span><span style="color: #FF0000">"sessionid"</span><span style="color: #990000">>></span>, <span style="color: #009900">SessionID</span>, <span style="color: #009900">Req0</span>, + #{<span style="color: #0000FF">secure</span> <span style="color: #990000">=></span> <span style="color: #000080">true</span>})<span style="color: #990000">.</span></tt></pre></div></div> +<div class="paragraph"><p>To prevent client-side scripts from accessing a cookie:</p></div> +<div class="listingblock"> +<div class="content"><!-- Generator: GNU source-highlight 3.1.8 +by Lorenzo Bettini +http://www.lorenzobettini.it +http://www.gnu.org/software/src-highlite --> +<pre><tt><span style="color: #009900">SessionID</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">generate_session_id</span></span>(), +<span style="color: #009900">Req</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:set_resp_cookie</span></span>(<span style="color: #990000"><<</span><span style="color: #FF0000">"sessionid"</span><span style="color: #990000">>></span>, <span style="color: #009900">SessionID</span>, <span style="color: #009900">Req0</span>, + #{<span style="color: #0000FF">http_only</span> <span style="color: #990000">=></span> <span style="color: #000080">true</span>})<span style="color: #990000">.</span></tt></pre></div></div> +<div class="paragraph"><p>Cookies may also be set client-side, for example using +Javascript.</p></div> +</div> +</div> +<div class="sect1"> +<h2 id="_reading_cookies">Reading cookies</h2> +<div class="sectionbody"> +<div class="paragraph"><p>The client only ever sends back the cookie name and value. +All other options that can be set are never sent back.</p></div> +<div class="paragraph"><p>Cowboy provides two functions for reading cookies. Both +involve parsing the cookie header(s) and so should not +be called repeatedly.</p></div> +<div class="paragraph"><p>You can get all cookies as a key/value list:</p></div> +<div class="listingblock"> +<div class="content"><!-- Generator: GNU source-highlight 3.1.8 +by Lorenzo Bettini +http://www.lorenzobettini.it +http://www.gnu.org/software/src-highlite --> +<pre><tt><span style="color: #009900">Cookies</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:parse_cookies</span></span>(<span style="color: #009900">Req</span>), +{<span style="color: #990000">_</span>, <span style="color: #009900">Lang</span>} <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">lists:keyfind</span></span>(<span style="color: #990000"><<</span><span style="color: #FF0000">"lang"</span><span style="color: #990000">>></span>, <span style="color: #993399">1</span>, <span style="color: #009900">Cookies</span>)<span style="color: #990000">.</span></tt></pre></div></div> +<div class="paragraph"><p>Or you can perform a match against cookies and retrieve +only the ones you need, while at the same time doing +any required post processing using <a href="../constraints">constraints</a>. +This function returns a map:</p></div> +<div class="listingblock"> +<div class="content"><!-- Generator: GNU source-highlight 3.1.8 +by Lorenzo Bettini +http://www.lorenzobettini.it +http://www.gnu.org/software/src-highlite --> +<pre><tt>#{<span style="color: #FF6600">id</span> <span style="color: #990000">:=</span> <span style="color: #009900">ID</span>, <span style="color: #FF6600">lang</span> <span style="color: #990000">:=</span> <span style="color: #009900">Lang</span>} <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:match_cookies</span></span>([<span style="color: #FF6600">id</span>, <span style="color: #FF6600">lang</span>], <span style="color: #009900">Req</span>)<span style="color: #990000">.</span></tt></pre></div></div> +<div class="paragraph"><p>You can use constraints to validate the values while matching +them. The following snippet will crash if the <code>id</code> cookie is +not an integer number or if the <code>lang</code> cookie is empty. Additionally +the <code>id</code> cookie value will be converted to an integer term:</p></div> +<div class="listingblock"> +<div class="content"><!-- Generator: GNU source-highlight 3.1.8 +by Lorenzo Bettini +http://www.lorenzobettini.it +http://www.gnu.org/software/src-highlite --> +<pre><tt><span style="color: #009900">CookiesMap</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:match_cookies</span></span>([{<span style="color: #FF6600">id</span>, <span style="color: #FF6600">int</span>}, {<span style="color: #FF6600">lang</span>, <span style="color: #FF6600">nonempty</span>}], <span style="color: #009900">Req</span>)<span style="color: #990000">.</span></tt></pre></div></div> +<div class="paragraph"><p>Note that if two cookies share the same name, then the map value +will be a list of the two cookie values.</p></div> +<div class="paragraph"><p>A default value can be provided. The default will be used +if the <code>lang</code> cookie is not found. It will not be used if +the cookie is found but has an empty value:</p></div> +<div class="listingblock"> +<div class="content"><!-- Generator: GNU source-highlight 3.1.8 +by Lorenzo Bettini +http://www.lorenzobettini.it +http://www.gnu.org/software/src-highlite --> +<pre><tt>#{<span style="color: #FF6600">lang</span> <span style="color: #990000">:=</span> <span style="color: #009900">Lang</span>} <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:match_cookies</span></span>([{<span style="color: #FF6600">lang</span>, [], <span style="color: #990000"><<</span><span style="color: #FF0000">"en-US"</span><span style="color: #990000">>></span>}], <span style="color: #009900">Req</span>)<span style="color: #990000">.</span></tt></pre></div></div> +<div class="paragraph"><p>If no default is provided and the value is missing, an +exception is thrown.</p></div> +</div> +</div> + + + <nav style="margin:1em 0"> |