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255 lines
6.9 KiB
HTML
255 lines
6.9 KiB
HTML
{% extends frame.html %}
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{% block body %}
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<!-- Text below generated with "markdown2 README.mkd" -->
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<h1>Pathod</h1>
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<p>Pathod is a pathological HTTP/S daemon, useful for testing and torturing client
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software. At Pathod's core is a small, terse language for crafting HTTP
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responses. The simplest way to use Pathod is to fire up the daemon, and specify
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the respnse behaviour you want using this language in the request URL. Here's a
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minimal example:</p>
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<pre><code>http://localhost:9999/p/200
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</code></pre>
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<p>Everything below the magic "/p/" path component is a response specifier - in
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this case just a vanilla 200 OK response. See the docs below to get (much)
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fancier. You can also add anchors to the Pathod server that serve a fixed
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response whenever a matching URL is requested:</p>
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<pre><code>pathod --anchor "/foo=200"
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</code></pre>
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<p>Here, the part before the "=" is a regex specifying the anchor path, and the
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part after is a response specifier.</p>
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<p>Pathod also has a nifty built-in web interface, which exposes activity logs,
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online help and various other goodies. Try it by visiting the server root:</p>
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<pre><code>http://localhost:9999
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</code></pre>
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<h1>Specifying Responses</h1>
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<p>The general form of a response is as follows:</p>
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<pre><code>code[MESSAGE]:[colon-separated list of features]
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</code></pre>
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<p>Here's the simplest possible response specification, returning just an HTTP 200
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OK message with no headers and no content:</p>
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<pre><code>200
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</code></pre>
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<p>We can embellish this a bit by specifying an optional custom HTTP response
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message (if we don't, Pathod automatically creates an appropriate one). By
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default for a 200 response code the message is "OK", but we can change it like
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this:</p>
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<pre><code>200"YAY"
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</code></pre>
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<p>The quoted string here is an example of a Value Specifier, a syntax that is
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used throughout the Pathod response specification language. In this case, the
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quotes mean we're specifying a literal string, but there are many other fun
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things we can do. For example, we can tell Pathod to generate 100k of random
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ASCII letters instead:</p>
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<pre><code>200@100k,ascii_letters
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</code></pre>
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<p>Full documentation on the value specification syntax can be found in the next
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section. </p>
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<p>Following the response code specifier is a colon-separateed list of features.
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For instance, this specifies a response with a body consisting of 1 megabyte of
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random data:</p>
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<pre><code>200:b@1m
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</code></pre>
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<p>And this is the same response with an ETag header added:</p>
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<pre><code>200:b@1m:h"Etag"="foo"
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</code></pre>
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<p>Both the header name and the header value are full value specifiers. Here's the
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same response again, but with a 1k randomly generated header name:</p>
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<pre><code>200:b@1m:h@1k,ascii_letters="foo"
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</code></pre>
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<p>A few specific headers have shortcuts, because they're used so often. The
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shorcut for the content-type header is "c":</p>
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<pre><code>200:b@1m:c"text/json"
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</code></pre>
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<p>That's it for the basic response definition. Now we can start mucking with the
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responses to break clients. One common hard-to-test circumstance is hangs or
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slow responses. Pathod has a pause operator that you can use to define
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precisely when and how long the server should hang. Here, for instance, we hang
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for 120 seconds after sending 50 bytes (counted from the first byte of the HTTP
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response):</p>
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<pre><code>200:b@1m:p120,50
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</code></pre>
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<p>If that's not long enough, we can tell Pathod to hang forever:</p>
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<pre><code>200:b@1m:p120,f
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</code></pre>
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<p>Or to send all data, and then hang without disconnecting:</p>
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<pre><code>200:b@1m:p120,a
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</code></pre>
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<p>We can also ask Pathod to hang randomly:</p>
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<pre><code>200:b@1m:pr,a
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</code></pre>
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<p>There is a similar mechanism for dropping connections mid-response. So, we can
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tell Pathod to disconnect after sending 50 bytes:</p>
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<pre><code>200:b@1m:d50
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</code></pre>
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<p>Or randomly:</p>
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<pre><code>200:b@1m:dr
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</code></pre>
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<p>All of these features can be combined. Here's a response that pauses twice,
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once at 10 bytes and once at 20, then disconnects at 5000:</p>
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<pre><code>200:b@1m:p10,10:p20,10:d5000
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</code></pre>
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<h1>Features</h1>
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<h4>hKEY=VALUE</h4>
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<p>Set a header. Both KEY and VALUE are full <em>Value Specifiers</em>. </p>
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<h4>bVALUE</h4>
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<p>Set the body. VALUE is a <em>Value Specifier</em>. When the body is set, Pathod will
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automatically set the appropriate Content-Length header.</p>
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<h4>cVALUE</h4>
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<p>A shortcut for setting the Content-Type header. Equivalent to:</p>
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<pre><code>h"Content-Type"=VALUE
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</code></pre>
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<h4>lVALUE</h4>
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<p>A shortcut for setting the Location header. Equivalent to:</p>
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<pre><code>h"Content-Type"=VALUE
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</code></pre>
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<h4>dOFFSET</h4>
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<p>Disconnect after OFFSET bytes. The offset can also be "r", in which case Pathod
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will disconnect at a random point in the response.</p>
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<h4>pSECONDS,OFFSET</h4>
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<p>Pause for SECONDS seconds after OFFSET bytes. SECONDS can also be "f" to pause
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forever. OFFSET can also be "r" to generate a random offset, or "a" for an
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offset just after all data has been sent.</p>
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<h1>Value Specifiers</h1>
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<p>There are three different flavours of value specification. </p>
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<h3>Literal</h3>
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<p>Literal values are specified as a quoted strings: </p>
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<pre><code>"foo"
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</code></pre>
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<p>Either single or double quotes are accepted, and quotes can be escaped with
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backslashes within the string:</p>
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<pre><code>'fo\'o'
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</code></pre>
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<h3>Files</h3>
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<p>You can load a value from a specified file path. To do so, you have to specify
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a <em>staticdir</em> option to Pathod on the command-line, like so: </p>
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<pre><code>pathod -d ~/myassets
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</code></pre>
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<p>All paths are relative paths under this directory. File loads are indicated by
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starting the value specifier with the left angle bracket:</p>
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<pre><code><my/path
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</code></pre>
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<p>The path value can also be a quoted string, with the same syntax as literals:</p>
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<pre><code><"my/path"
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</code></pre>
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<h3>Generated values</h3>
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<p>An @-symbol lead-in specifies that generated data should be used. There are two
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components to a generator specification - a size, and a data type. By default
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Pathod assumes a data type of "bytes". </p>
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<p>Here's a value specifier for generating 100 bytes:</p>
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<pre><code>@100
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</code></pre>
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<p>You can use standard suffixes to indicate larger values. Here, for instance, is
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a specifier for generating 100 megabytes:</p>
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<pre><code>@100m
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</code></pre>
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<p>The supported suffixes are:</p>
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<pre><code>b = 1024**0 (bytes)
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k = 1024**1 (kilobytes)
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m = 1024**2 (megabytes)
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g = 1024**3 (gigabytes)
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t = 1024**4 (terabytes)
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</code></pre>
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<p>Data types are separated from the size specification by a comma. This
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specification generates 100mb of ASCII:</p>
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<pre><code>@100m,ascii
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</code></pre>
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<p>Supported data types are:</p>
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<pre><code>ascii_letters
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ascii_lowercase
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ascii_uppercase
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digits
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hexdigits
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letters
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lowercase
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octdigits
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printable
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punctuation
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uppercase
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whitespace
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ascii
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bytes
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</code></pre>
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{% end %}
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