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218 lines
21 KiB
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<!-- This manual documents Guile version 3.0.10.
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Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
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Inc.
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with no
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Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
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copy of the license is included in the section entitled "GNU Free
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Documentation License." -->
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<title>Responses (Guile Reference Manual)</title>
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Web.html" rel="up" title="Web">
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<link href="Web-Client.html" rel="next" title="Web Client">
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<body lang="en">
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<div class="subsection-level-extent" id="Responses">
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<div class="nav-panel">
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<p>
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Next: <a href="Web-Client.html" accesskey="n" rel="next">Web Client</a>, Previous: <a href="Requests.html" accesskey="p" rel="prev">HTTP Requests</a>, Up: <a href="Web.html" accesskey="u" rel="up"><abbr class="acronym">HTTP</abbr>, the Web, and All That</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<h4 class="subsection" id="HTTP-Responses"><span>7.3.7 HTTP Responses<a class="copiable-link" href="#HTTP-Responses"> ¶</a></span></h4>
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<div class="example">
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<pre class="example-preformatted">(use-modules (web response))
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</pre></div>
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<p>As with requests (see <a class="pxref" href="Requests.html">HTTP Requests</a>), Guile offers a data type for HTTP
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responses. Again, the body is represented separately from the request.
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</p>
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<dl class="first-deffn">
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<dt class="deffn" id="index-response_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-response_003f"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dversion"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-version</strong> <var class="def-var-arguments">response</var><a class="copiable-link" href="#index-response_002dversion"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dcode"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-code</strong> <var class="def-var-arguments">response</var><a class="copiable-link" href="#index-response_002dcode"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dreason_002dphrase"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-reason-phrase</strong> <var class="def-var-arguments">response</var><a class="copiable-link" href="#index-response_002dreason_002dphrase"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dheaders"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-headers</strong> <var class="def-var-arguments">response</var><a class="copiable-link" href="#index-response_002dheaders"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dport"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-port</strong> <var class="def-var-arguments">response</var><a class="copiable-link" href="#index-response_002dport"> ¶</a></span></dt>
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<dd><p>A predicate and field accessors for the response type. The fields are as
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follows:
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</p><dl class="table">
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<dt><code class="code">version</code></dt>
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<dd><p>The HTTP version pair, like <code class="code">(1 . 1)</code>.
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</p></dd>
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<dt><code class="code">code</code></dt>
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<dd><p>The HTTP response code, like <code class="code">200</code>.
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</p></dd>
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<dt><code class="code">reason-phrase</code></dt>
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<dd><p>The reason phrase, or the standard reason phrase for the response’s
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code.
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</p></dd>
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<dt><code class="code">headers</code></dt>
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<dd><p>The response headers, as an alist of parsed values.
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</p></dd>
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<dt><code class="code">port</code></dt>
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<dd><p>The port on which to read or write a response body, if any.
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</p></dd>
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</dl>
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</dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-read_002dresponse"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">read-response</strong> <var class="def-var-arguments">port</var><a class="copiable-link" href="#index-read_002dresponse"> ¶</a></span></dt>
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<dd><p>Read an HTTP response from <var class="var">port</var>.
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</p>
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<p>As a side effect, sets the encoding on <var class="var">port</var> to ISO-8859-1
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(latin-1), so that reading one character reads one byte. See the
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discussion of character sets in <a class="ref" href="#Responses">HTTP Responses</a>, for more information.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-build_002dresponse"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">build-response</strong> <var class="def-var-arguments">[#:version=’(1 . 1)] [#:code=200] [#:reason-phrase=#f] [#:headers=’()] [#:port=#f] [#:validate-headers?=#t]</var><a class="copiable-link" href="#index-build_002dresponse"> ¶</a></span></dt>
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<dd><p>Construct an HTTP response object. If <var class="var">validate-headers?</var> is true,
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the headers are each run through their respective validators.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-adapt_002dresponse_002dversion"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">adapt-response-version</strong> <var class="def-var-arguments">response version</var><a class="copiable-link" href="#index-adapt_002dresponse_002dversion"> ¶</a></span></dt>
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<dd><p>Adapt the given response to a different HTTP version. Return a new HTTP
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response.
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</p>
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<p>The idea is that many applications might just build a response for the
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default HTTP version, and this method could handle a number of
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programmatic transformations to respond to older HTTP versions (0.9 and
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1.0). But currently this function is a bit heavy-handed, just updating
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the version field.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-write_002dresponse"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">write-response</strong> <var class="def-var-arguments">r port</var><a class="copiable-link" href="#index-write_002dresponse"> ¶</a></span></dt>
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<dd><p>Write the given HTTP response to <var class="var">port</var>.
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</p>
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<p>Return a new response, whose <code class="code">response-port</code> will continue writing
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on <var class="var">port</var>, perhaps using some transfer encoding.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-response_002dmust_002dnot_002dinclude_002dbody_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-must-not-include-body?</strong> <var class="def-var-arguments">r</var><a class="copiable-link" href="#index-response_002dmust_002dnot_002dinclude_002dbody_003f"> ¶</a></span></dt>
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<dd><p>Some responses, like those with status code 304, are specified as never
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having bodies. This predicate returns <code class="code">#t</code> for those responses.
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</p>
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<p>Note also, though, that responses to <code class="code">HEAD</code> requests must also not
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have a body.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-response_002dbody_002dport"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-body-port</strong> <var class="def-var-arguments">r [#:decode?=#t] [#:keep-alive?=#t]</var><a class="copiable-link" href="#index-response_002dbody_002dport"> ¶</a></span></dt>
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<dd><p>Return an input port from which the body of <var class="var">r</var> can be read. The encoding
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of the returned port is set according to <var class="var">r</var>’s <code class="code">content-type</code> header,
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when it’s textual, except if <var class="var">decode?</var> is <code class="code">#f</code>. Return <code class="code">#f</code>
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when no body is available.
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</p>
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<p>When <var class="var">keep-alive?</var> is <code class="code">#f</code>, closing the returned port also closes
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<var class="var">r</var>’s response port.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-read_002dresponse_002dbody"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">read-response-body</strong> <var class="def-var-arguments">r</var><a class="copiable-link" href="#index-read_002dresponse_002dbody"> ¶</a></span></dt>
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<dd><p>Read the response body from <var class="var">r</var>, as a bytevector. Returns <code class="code">#f</code>
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if there was no response body.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-write_002dresponse_002dbody"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">write-response-body</strong> <var class="def-var-arguments">r bv</var><a class="copiable-link" href="#index-write_002dresponse_002dbody"> ¶</a></span></dt>
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<dd><p>Write <var class="var">bv</var>, a bytevector, to the port corresponding to the HTTP
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response <var class="var">r</var>.
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</p></dd></dl>
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<p>As with requests, the various headers that are typically associated with
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HTTP responses may be accessed with these dedicated accessors.
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See <a class="xref" href="HTTP-Headers.html">HTTP Headers</a>, for more information on the format of parsed
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headers.
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</p>
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<dl class="first-deffn">
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<dt class="deffn" id="index-response_002daccept_002dranges"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-accept-ranges</strong> <var class="def-var-arguments">response [default=#f]</var><a class="copiable-link" href="#index-response_002daccept_002dranges"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dage"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-age</strong> <var class="def-var-arguments">response [default=’()]</var><a class="copiable-link" href="#index-response_002dage"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dallow"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-allow</strong> <var class="def-var-arguments">response [default=’()]</var><a class="copiable-link" href="#index-response_002dallow"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dcache_002dcontrol"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-cache-control</strong> <var class="def-var-arguments">response [default=’()]</var><a class="copiable-link" href="#index-response_002dcache_002dcontrol"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dconnection"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-connection</strong> <var class="def-var-arguments">response [default=’()]</var><a class="copiable-link" href="#index-response_002dconnection"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dcontent_002dencoding"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-content-encoding</strong> <var class="def-var-arguments">response [default=’()]</var><a class="copiable-link" href="#index-response_002dcontent_002dencoding"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dcontent_002dlanguage"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-content-language</strong> <var class="def-var-arguments">response [default=’()]</var><a class="copiable-link" href="#index-response_002dcontent_002dlanguage"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dcontent_002dlength"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-content-length</strong> <var class="def-var-arguments">response [default=#f]</var><a class="copiable-link" href="#index-response_002dcontent_002dlength"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dcontent_002dlocation"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-content-location</strong> <var class="def-var-arguments">response [default=#f]</var><a class="copiable-link" href="#index-response_002dcontent_002dlocation"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dcontent_002dmd5"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-content-md5</strong> <var class="def-var-arguments">response [default=#f]</var><a class="copiable-link" href="#index-response_002dcontent_002dmd5"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dcontent_002drange"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-content-range</strong> <var class="def-var-arguments">response [default=#f]</var><a class="copiable-link" href="#index-response_002dcontent_002drange"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dcontent_002dtype"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-content-type</strong> <var class="def-var-arguments">response [default=#f]</var><a class="copiable-link" href="#index-response_002dcontent_002dtype"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002ddate"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-date</strong> <var class="def-var-arguments">response [default=#f]</var><a class="copiable-link" href="#index-response_002ddate"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002detag"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-etag</strong> <var class="def-var-arguments">response [default=#f]</var><a class="copiable-link" href="#index-response_002detag"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dexpires"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-expires</strong> <var class="def-var-arguments">response [default=#f]</var><a class="copiable-link" href="#index-response_002dexpires"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dlast_002dmodified"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-last-modified</strong> <var class="def-var-arguments">response [default=#f]</var><a class="copiable-link" href="#index-response_002dlast_002dmodified"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dlocation"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-location</strong> <var class="def-var-arguments">response [default=#f]</var><a class="copiable-link" href="#index-response_002dlocation"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dpragma"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-pragma</strong> <var class="def-var-arguments">response [default=’()]</var><a class="copiable-link" href="#index-response_002dpragma"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dproxy_002dauthenticate"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-proxy-authenticate</strong> <var class="def-var-arguments">response [default=#f]</var><a class="copiable-link" href="#index-response_002dproxy_002dauthenticate"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dretry_002dafter"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-retry-after</strong> <var class="def-var-arguments">response [default=#f]</var><a class="copiable-link" href="#index-response_002dretry_002dafter"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dserver"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-server</strong> <var class="def-var-arguments">response [default=#f]</var><a class="copiable-link" href="#index-response_002dserver"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dtrailer"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-trailer</strong> <var class="def-var-arguments">response [default=’()]</var><a class="copiable-link" href="#index-response_002dtrailer"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dtransfer_002dencoding"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-transfer-encoding</strong> <var class="def-var-arguments">response [default=’()]</var><a class="copiable-link" href="#index-response_002dtransfer_002dencoding"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dupgrade"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-upgrade</strong> <var class="def-var-arguments">response [default=’()]</var><a class="copiable-link" href="#index-response_002dupgrade"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dvary"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-vary</strong> <var class="def-var-arguments">response [default=’()]</var><a class="copiable-link" href="#index-response_002dvary"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dvia"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-via</strong> <var class="def-var-arguments">response [default=’()]</var><a class="copiable-link" href="#index-response_002dvia"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dwarning"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-warning</strong> <var class="def-var-arguments">response [default=’()]</var><a class="copiable-link" href="#index-response_002dwarning"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-response_002dwww_002dauthenticate"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">response-www-authenticate</strong> <var class="def-var-arguments">response [default=#f]</var><a class="copiable-link" href="#index-response_002dwww_002dauthenticate"> ¶</a></span></dt>
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<dd><p>Return the given response header, or <var class="var">default</var> if none was present.
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</p></dd></dl>
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<dl class="first-deffn">
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||
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<dt class="deffn" id="index-text_002dcontent_002dtype_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">text-content-type?</strong> <var class="def-var-arguments"><var class="var">type</var></var><a class="copiable-link" href="#index-text_002dcontent_002dtype_003f"> ¶</a></span></dt>
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<dd><p>Return <code class="code">#t</code> if <var class="var">type</var>, a symbol as returned by
|
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<code class="code">response-content-type</code>, represents a textual type such as
|
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<code class="code">text/plain</code>.
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</p></dd></dl>
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</div>
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<hr>
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<div class="nav-panel">
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<p>
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Next: <a href="Web-Client.html">Web Client</a>, Previous: <a href="Requests.html">HTTP Requests</a>, Up: <a href="Web.html"><abbr class="acronym">HTTP</abbr>, the Web, and All That</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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