All 134 hints checked by the Audisto Crawler

The Audisto Crawler checks websites against a list of common mistakes and issues. Here you find a full list of all hints that the Audisto Crawler checks automatically on each crawl of a website.

Table Of Content

Hints

<a> has both href and onclick attribute
If a link with a href attribute and an onclick attribute is found, the URL is flagged with this hint.
<a> has malformed href
If a malformed href is found, the URL is flagged with this hint.
<a> has no content
If a link without content is found, the URL is flagged with this hint.
<a> has no href attribute
If a link without a href attribute is found, the URL is flagged with this hint.
<a> href attribute has leading or trailing whitespace characters
If a leading or trailing whitespace gets dicovered in a HTML anchor tag, the linking URL gets flagged with this hint.
<a> href is empty
If a link with an empty href attribute or an href that contains only white-space is found, the URL is flagged with this hint.
<a> link contains user and password
An anchor's href contains user and password, like http://user:password@example.com.
<a> link uses a websocket protocol
An anchor's href uses a websocket protocol (either ws: or wss:).
<a> link uses an unknown protocol
An anchor's href uses a protocol that is unknown to our crawler.
<a> link uses data: protocol
An anchor's href uses the data: protocol.
<a> link uses file: protocol
An anchor's href uses the file: protocol, which is used to open files on the users computer.
<a> link uses ftp: protocol
An anchor's href uses the ftp: protocol to link to a FTP server.
<a> link uses javascript: protocol
An anchor's href uses the javascript: protocol, which may execute arbitrary JavaScript code.
<a> link uses mailto: protocol
An anchor's href uses the mailto: protocol.
<a> link uses sftp: protocol
An anchor's href uses the sftp: protocol to link to a SFTP server.
<a> linking relative to base
If links are found, that are relative to the base, the URL is flagged with this hint.
<a> links to fragment by name attribute on non-anchor
The anchor contains a fragment link, but the target is defined by a name attribute and it not an anchor itself.
<a> links to fragment by name attribute, not id
The anchor contains a fragment link, like "#top", but the target is defined by a name attribute.
<a> links to fragment only
The anchor tag contains a fragment-only link target, like "#top".
<a> links to fragment only, but <base> points to other URL
<a> links to fragment only, while there is a <base> pointing to another URL
<a> links to fragment that was not found
The anchor contains a fragment link, like "#top", but there was no according id or name attribute found in the document.
<a> more than 100 links
If more than 100 unique links are found, the URL is flagged with this hint.
<a> no outgoing internal links
If the HTML contains no internal links, the URL is flagged with this hint.
<base> contains malformed or empty href
A <base> tag was found, but its href attribute contains an invalid URL, or a URL that is neither HTTP nor HTTPS.
<base> found
If a base is set in the HTML, the URL is flagged with this hint.
<base> found more than once and differs
More than one <base> directives were found with a differing href attribute value.
<base> href contains a path only
The <base> tag's href attribute contains a path, not an absolute URL.
<base> is same as URL
A <base> tag was found, but points to the same URL, rendering itself useless.
<base> occurs more than once
More than one <base> tag was found.
<base> points to other URL
A <base> tag was found, and points to another URL.
<form> POST to HTTPS from HTTP
The form posts to a HTTPS URL, but resides on a HTTP URL.
<form> Unsafe GET to HTTP from HTTPS
A form uses the GET method and submits itself to a HTTP URL, but resides on a HTTPS URL.
<form> Unsafe POST to HTTP from HTTPS
A form uses the POST method and submits itself to a HTTP URL, but resides on a HTTPS URL.
<form> method is GET
If a form using the GET-method is found, the URL is flagged with this hint.
<frameset> found
If a <frameset> is found, the URL is flagged with this hint.
<frameset> found, but <noframes> missing
A <frameset> was found, but a <noframes> is missing.
<h1> and <h2> not found
If no h1- and h2-headline are found, the URL is flagged with this hint.
<h1> not found
If the HTML does not contain a h1-headline, the URL is flagged with this hint.
<h1> occurs more than once
If more than one <h1> tag is found, the URL is flagged with this hint.
<h1>-<h6> chain broken
If the HTML contains a broken <h1>-<h6> chain, the URL is flagged with this hint.
<html> contains too many uncommon non-printable characters
The HTML documents contains too many uncommon non-printable characters, and not all will be shown in live analysis.
<html> contains uncommon non-printable characters
If uncommon non-printable characters are detected, the URL of the document containing the character will be flagged.
<html> contains unencoded Left-To-Right-Mark or Right-To-Left-Mark
A Left-To-Right- or Right-To-Left-Mark was found, but it is unescaped.
<html> contains unencoded soft hyphen (SHY)
A soft hyphen was found, but it is unescaped.
<html> is more than 100 KB in size
If a document is more than 100 KB in size, the URL is flagged with this hint.
<html> starts with BOM
There is an unicode byte order mark (BOM) at top of the HTML.
<iframe> found
If an iframe is found, the URL is flagged with this hint.
<img> alt attribute exists but empty
If an image with an empty alt attribute is found, the URL is flagged with this hint.
<img> has no alt attribute
If an image without an alt attribute is found, the URL is flagged with this hint.
<img> has no width and/or height attribute
If an image without a width or height attribute is found, the URL is flagged with this hint.
<link rel="canonical"> URL is not absolute
If the canonical element specifies a URL relative to the document's URL, the document's URL is flagged with this hint.
<link rel="canonical"> contains malformed or empty href
This hint identifies all occurrences of canonical elements that contain an invalid target URL.
<link rel="canonical"> found
A canonical-element has been found, either as a <link> tag with rel="canonical" or an according link header.
<link rel="canonical"> found outside <head>
A canonical element was placed outside of the <head> section, search engines will ignore it.
<link rel="canonical"> found twice
More than one canonical elements was found, either as a <link> tag with rel="canonical" or an according link header.
<link rel="canonical"> found twice and differs
More than one canonical elements have been found, either as a <link> tag with rel="canonical" or an according Link header. Additionally, they specify different targets.
<link rel="canonical"> not found
A canonical element has not been found, neither a <link> tag with rel="canonical" nor an according link header. This may be intended.
<link rel="canonical"> points to other URL
If the canonical-element is found and points to a different URL, the URL is flagged with this hint.
<link rel="canonical"> points to same URL
If the canonical element is found and points to the same URL, the URL is flagged with this hint.
<link> found outside <head>
A <link> tag was placed outside of the <head> section, where it may have no effects.
<meta description> missing or empty
If the meta-description is missing or empty, the URL is flagged with this hint.
<meta description> occurs more than once
If a meta description is found more than once in the HTML, the URL is flagged with this hint.
<meta description> too long for Google snippet
If the meta description is too long to be displayed in the snippet in search results, the URL is flagged with this hint.
<meta keywords> found
If the HTML contains meta-keywords, the URL is flagged with this hint.
<meta language> found
<meta name=language> was found. Use the lang-attribute on the <html> tag instead.
<meta refresh> found
If a meta-refresh is found the URL is flagged with this hint.
<meta> found outside <head>
A <meta> tag was placed outside of the <head> section, where it may have no effects.
<script> loaded multiple files from local domain
If multiple JavaScript-files from the crawled domain are loaded, the URL is flagged with this hint.
<script> more than 3 KB within HTML
If more than 3 KB of JavaScript is found within the HTML, the URL is flagged with this hint.
<title> found outside <head>
A <title> tag was placed outside of the <head> section, where it may have no effect.
<title> missing or empty
If <title> tag is missing, the URL is flagged with this hint.
<title> occurs more than once
If the <title> tag is found more than once in the source code, the URL is flagged with this hint.
<title> short or single word
If the title of a document has less than 10 chars or only a single word, the URL is flagged with this hint.
<title> too long for Google snippet
If the title of a document is too long to be displayed in snippets in search results, the URL is flagged with this hint.
CSS <style> content larger than 0.5 KB
If more than 0.5 KB of CSS is found with <style> tags, the URL is flagged with this hint.
CSS <style> found
If CSS is found within a <style> tag the URL is flagged with this hint.
CSS loaded multiple files from local domain
If multiple CSS files from the domain of the crawl are loaded by the URL, it is flagged with this hint.
CSS style attribute found
If CSS is found as a style-attribute, the URL is flagged with this hint.
Charset: Charset set in HTTP Content-Type header and in document differ.
Both the document and the HTTP Content-Type header specify a charset, but these are not identical.
Charset: Invalid charset in Content-Type HTTP header
The Content-Type HTTP header does specify an invalid charset.
Charset: Not set
There is no charset set, neither in the Content-Type HTTP header, nor in the document, e.g. through a <meta> tag.
Charset: Not set in Content-Type HTTP header
The Content-Type HTTP header does not specify a charset.
Charset: Not set in document
There is no charset set in the document, e.g. through a <meta> tag.
Compression not enabled
Content compression was not enabled, or the gzip/deflate compression is not supported by the server.
Content-Security-Policy HTTP Header missing
Cookies set without secure flag
Duplicate id attributes
The same ID was assigned to several elements.
Hreflang: Found
<link>-tag with hreflang-attribute was found
Hreflang: Language tags in HTML and hreflang self link differ
<link>-tag with hreflang-attribute points to current URL, but the language is different than the one set in the HTML.
Hreflang: Self link found, but document has no language
<link>-tag with hreflang-attribute points to current URL, but the document itself has no language set.
Hreflang: Self link missing
<link>-tags with hreflang-attribute where found, but none of them points to the current URL.
Hreflang: URL empty or malformed
<link>-tag with hreflang-attribute was found, but the URL it points to is invalid
Hreflang: URL is not absolute
If the hreflang element specifies a URL relative to the current URL, it is flagged with this hint.
Linked as a resource
The element was linked to as a resource, like an image, a CSS file, a script, or the source of a frame.
Linking: Follow link to a so far no-follow URL
A follow link was found, linking to a URL that was previously linked "nofollow" only.
Linking: Nofollow link to a follow URL
A link with rel="nofollow" was found, linking to a URL that was previously linked "follow" already.
Linking: Nofollow linking revoked later on
A URL that has been linked no-follow has later - that is on the same or a deeper level - been linked to as follow.
Redirect Chains: 2nd level
This hint shows redirects, that point to a redirect target, making it the first element in a redirect chain.
Redirect Chains: 3rd level
This report highlights all elements on the 3rd level in a redirect chain.
Redirect Chains: 4th level
This report highlights all elements on the 4th level in a redirect chain.
Redirect Chains: 5th level or higher
This report highlights all elements on the 5th level in a redirect chain.
Redirect Loops: Redirect loop starts here
This URL is the first element in a redirect loop. A redirect loop is a chain of redirects that ultimately redirects to this URL again.
Redirect: 1st level
This hint identifies redirects that have internal links on the site.
Redirect: Host change
A redirect is forwarding the user to another host.
Redirect: Location URL is not HTTP or HTTPS
Redirect leads to a URL that is neither HTTP nor HTTPS
Redirect: Non-ASCII Characters in Location URL
Only printable ASCII characters are allowed in HTTP header values and redirect location URLs.
Redirect: Protocol change
A redirect changes the protocol from HTTP to HTTPS or vice versa.
Redirect: To external URL
Redirect leads to a URL that is not within the crawled domain(s).
Robots: Directives Missing
No robots meta tag or X-Robots-Tag header directive was found.
Robots: Specified more than once
Robots directives were specified more than once. If a document contains more than one robots definition, it will be flagged.
Robots: follow
The URL is set to "follow" by a robots directive, either per robots meta tag or the X-Robots-Tag header.
Robots: index
The URL is set to "index" by all robots directives, either per robots meta tag or the X-Robots-Tag header.
Robots: nofollow
The site is set to "nofollow" by a robots directive, either per robots meta tag or the X-Robots-Tag header.
Robots: nofollow differs across specifications
There is more than one source for robots, either a robots meta tag or a X-Robots-Tag header, and at least one specifies "nofollow" while another does not.
Robots: noindex
The site is set to "noindex" by a robots directive, either per robots meta tag or the X-Robots-Tag header.
Robots: noindex differs across specifications
There is more than one source for robots directives, either a robots meta tag or a X-Robots-Tag header, and at least one specifies "noindex" while another does not.
Safe HTTPS URL loads unsafe resource
If a HTTPS URL contains an unsafe resource, that is loaded using HTTP, it is flagged with this hint.
Strict-Transport-Security HTTP Header has short duration
Strict-Transport-Security HTTP Header is invalid
Strict-Transport-Security HTTP Header missing
Strict-Transport-Security HTTP Header send more than once
URL contains escaped characters in path
If the URL contains escaped chars (non-ascii) in the path, it is flagged with this hint.
URL has & in path
If the URL has an ampersand (&) in the path, this hint in triggered.
URL has // in path
If the URL contains two consecutive slashes, it is flagged with this hint.
URL has 3 or more query parameters
If the URL contains a query string with 3 or more parameters, it is flagged with this hint.
URL has ? in query
If the URL has a question mark (?) in the query, this hint in triggered.
URL has more than 115 characters
If the URL is more than 115 characters long, it is flagged with this hint.
URL has non-ascii, non-lowercase elements in path
If the URL contains escaped- or non-lowercase chars, the URL is flagged with this hint.
URL has non-lowercase elements in path
If the URL contains non lowercase characters, it is flagged with this hint.
URL has query
If the URL contains a query string, it is flagged with this hint.
URL has repetitive elements in path
If the URL contains repeating elements like /foo/foo/ or /foo/bar/foo/bar/ in path, it triggers this hint.
URL has repetitive parameters in query
If the URL contains repeating parameters like ?a=1&a=1 or ?b=1&b=2 in query, it triggers this hint.
URL has repetitive parameters in query, values differ
If the URL contains repeating parameters in query, and the values are different, like ?a=1&a=2, it triggers this hint.
URL too long for some browsers
If a URL longer than 2000 characters is encountered, it is flagged with this hint, since some browsers are unable to handle URLs of this size.