User agent robots txt

The User-agent: * means this section applies to all robots. The Disallow: / tells the robot that it should not visit any pages on the site. There are two important considerations when using /robots.txt A robots.txt file consists of one or more blocks of directives, each starting with a user-agent line. The user-agent is the name of the specific spider it addresses. You can either have one block for all search engines, using a wildcard for the user-agent, or specific blocks for specific search engines Robots are applications that crawl through websites, documenting (i.e. indexing) the information they cover. In regards to the Robots.txt file, these robots are referred to as User-agents. You may also hear them called: Spiders. Bots Some user agents (robots) may choose to ignore your robots.txt file. This is especially common with more nefarious crawlers like malware robots or email address scrapers. The /robots.txt file is a publicly available: just add /robots.txt to the end of any root domain to see that website's directives (if that site has a robots.txt file!) It blocks (good) bots (e.g, Googlebot) from indexing any page. The User-agent: * means this section applies to all robots. The Disallow: / tells the robot that it should not visit any pages on the site. There are two important considerations when using /robots.txt: robots can ignore your /robots.txt

If you want to instruct all robots to stay away from your site, then this is the code you should put in your robots.txt to disallow all: User-agent: * Disallow: / The User-agent: * part means that it applies to all robots. The Disallow: / part means that it applies to your entire website شما می‌توانید با قرار دادن نام هر یک از ربات‌ها به‌عنوان User-agent قوانین معینی برای آن‌ها تعریف کنید و با استفاده از کاراکتر به‌جای نام در فایل robots.txt یک قانون را برای همه روبات‌ها اعمال کنید robots.txt는 검색로봇에게 사이트 및 웹페이지를 수집할 수 있도록 허용하거나 제한하는 국제 권고안 입니다. robots.txt 파일은 항상 사이트의 루트 디렉터리에 위치해야 하며 로봇 배제 표준 을 따르는 일반 텍스트 파일로 작성해야 합니다. 네이버 검색로봇은 robots.txt에 작성된 규칙을 준수하며, 만약 사이트의 루트 디렉터리에 robots.txt 파일이 없다면 모든 콘텐츠를 수집할 수. A robots.txt file is just a text file with no HTML markup code (hence the .txt extension). The robots.txt file is hosted on the web server just like any other file on the website. In fact, the robots.txt file for any given website can typically be viewed by typing the full URL for the homepage and then adding /robots.txt, like https://www.cloudflare.com/robots.txt The asterisk after User-agent: * means that the robots.txt file is for all web robots that visit your site. And like mentioned, the Disallow: /wp-admin/ tells robots to not visit your wp-admin page. You can test your robots.txt file by adding /robots.txt at the end of your domain name

Video: About /robots.txt - The Web Robots Page

Where several user agents are recognized in the robots.txt file, Google will follow the most specific. If you want all of Google to be able to crawl your pages, you don't need a robots.txt file at.. Eine robots.txt besteht aus Datensätzen (records), welche wiederum grundsätzlich aus zwei Teilen bestehen. Im ersten Teil wird angegeben, für welche Robots (User-agent) die nachfolgenden Anweisungen gelten. Im zweiten Teil werden die Anweisungen selbst notiert All user-agents are case sensitive in robots.txt. You can also use the star (*) wildcard to assign directives to all user-agents. For example, let's say that you wanted to block all bots except Googlebot from crawling your site

User-agents listed in the robots.txt file: For each one of those you need to check whether or not they are blocked from fetching a certain URL (or pattern). * all other user-agents: The * includes all other user-agents, so checking the rules that apply to it should take care of the rest User-agent: * Disallow: /wp-admin/ User-agent: Bingbot Disallow: / In this example, all bots will be blocked from accessing /wp-admin/, but Bingbot will be blocked from accessing your entire site. Testing Your Robots.txt File. You can test your WordPress robots.txt file in Google Search Console to ensure it's setup correctly. Simply click into your site, and under Crawl click on. 先说User-agent,爬虫抓取时会声明自己的身份,这就是User-agent,没错,就是http协议里的User-agent。 robots.txt利用User-agent来区分各个引擎的爬虫,比如说google网页搜索爬虫的User-agent为Googlebot The robots.txt file can usually be found in the root directory of the web server (for example, http://www.example.com/robots.txt). In order for us to access your whole site, ensure that your robots.txt file allows both user-agents 'Googlebot' (used for landing pages) and 'Googlebot-image' (used for images) to crawl your site

The ultimate guide to robots

The text file should be saved in ASCII or UTF-8 encoding. Bots are referenced as user-agents in the robots.txt file. In the beginning of the file, start the first section of directives applicable to all bots by adding this line: User-agent: * Create a list of Disallow directives listing the content you want blocked User-agent in robots.txt. Each search engine should identify themself with a user-agent. Google's robots identify as Googlebot for example, Yahoo's robots as Slurp and Bing's robot as BingBot and so on. The user-agent record defines the start of a group of directives A general user agent and a magicsearchbot user agent are defined. Make sure there are no allow or disallow directives before user-agent # User-agent names define the sections of your robots.txt file. Search engine crawlers use those sections to determine which directives to follow The Robots Database lists robot software implementations and operators. Robots listed here have been submitted by their owners, or by web site owners who have been visited by the robots. A listing here does not mean that a robot is endorsed in any way. For a list of User-Agents (including bots) in the wild, see www.botsvsbrowsers.com

Disallow Author and Category in robots

Robots.txt File - What Is It? How to Use It? // WEBRI

  1. 在robots.txt文件中,如果有多条User-agent记录说明有多个robot会受到robots.txt的限制,对该文件来说,至少要有一条User-agent记录。如果该项的值设为*,则对任何robot均有效,在robots.txt文件中,User-agent:*这样的记录只能有一条
  2. / How to Test Your Created Robots.txt file in Google Search Console. Now that you've created the robots.txt file in WordPress, you will want to be sure it's working as it should. And there is no better way to do that other than using a robots.txt.
  3. User-agent: * Disallow: / User-agent: DuckDuckBot Allow: / Sidenote: If there are contradictory commands in the robots.txt file, the bot will follow the more granular command. That's why in the above example, DuckDuckBot knows to crawl the website, even though a previous directive (applying to all bots) said do not crawl
  4. このrobots.txtでは、主にクローラーの制限を行う際に活用します。 例えば、User-Agentでクローラーの種類を指定して、その指定したクローラーが特定のファイルをクロールしないように、DisallowでファイルのURLパスを指定します
  5. ute data to our users. Link data collected by Ahrefs Bot from the web is used.
  6. robots.txt の設定方法、User-agent、Disallow の書き方、迷惑なロボットのアクセスを禁止する例。 robots.txt ロボット(Robot)は、ボット(Bot)、クローラー(Crawler)、スパイダー(Spider)など、呼び方はいろいろあります

Robots.txt File [2021 Examples] [Robots.txt Disallow All ..

Strictly speaking, a user-agent can be anything that requests web pages, including search engine crawlers, web browsers, or obscure command line utilities. User-agent directive. In a robots.txt file, the user-agent directive is used to specify which crawler should obey a given set of rules A robots.txt file is made up of multiple sections of 'directives', each beginning with a specified user-agent. The user agent is the name of the specific crawl bot that the code is speaking to. There are two options available: You can use a wildcard to address all search engines at once. You can address specific search engines individually User-agent: * Disallow: / Creating robots.txt file in document root. Now go to your project folder and create a text file robot.txt in the project root. Details in the image

A general user agent and a magicsearchbot user agent are defined. Make sure there are no allow or disallow directives before user-agent # User-agent names define the sections of your robots.txt file. Search engine crawlers use those sections to determine which directives to follow robots.txt File Syntax and Rules. The robots.txt file uses basic rules as follows: User-agent: The robot the following rule applies to Disallow: The URL you want to block. Allow: The URL you want to allow. Examples: The default robots.txt. To block all robots from the entire server create or upload robots.txt file as follows

Let's first study each of them after that we will learn how to add custom robots.txt file in blogspot blogs. User-agent: Mediapartners-Google . This code is for Google Adsense robots which help them to serve better ads on your blog. Either you are using Google Adsense on your blog or not simply leave it as it is Exemple de contenu d'un fichier robots.txt : User-agent: * Disallow: L'instruction User-agent: * signifie que la ou les instruction(s) qui suivent s'applique pour tous les robots. L'instruction Disallow: signifie que le moteur peut parcourir l'ensemble des répertoires et des pages du site User-agent: Disallow: Allow: Crawl-delay: Sitemap: Tuy nhiên, bạn vẫn có thể lược bỏ các phần Crawl-delay và Sitemap. Đây là định dạng cơ bản của robots.txt WordPress hoàn chỉnh. Tuy nhiên trên thực tế thì file robots.txt chứa nhiều dòng User-agent và nhiều chỉ thị của người dùng hơn

robots.txt - What does User-agent: * Disallow: / mean ..

Robots.txt is made up of two basic parts: User-agent and directives. User-Agent. User-agent is the name of the spider being addressed, while the directive lines provide the instructions for that particular user-agent. The User-agent line always goes before the directive lines in each set of directives. A very basic robots.txt looks like this Robots.txt syntax can be thought of as the language of robots.txt files. There are 5 common terms you're likely to come across in a robots.txt file. They are: User-agent: The specific web crawler to which you're giving crawl instructions (usually How to ignore robots.txt files. Whether or not a webmaster will make an exception for our crawler in the manner described above, you can ignore robots exclusions and thereby crawl material otherwise blocked by a robots.txt file by requesting that we enable this special feature for your account. To get started, please contact our Web Archivists directly, identify any specific hosts or types of. How robots.txt files work. Your robots.txt file tells search engines how to crawl pages hosted on your website. The two main components of your robots.txt file are: User-agent: Defines the search engine or web bot that a rule applies to. An asterisk (*) can be used as a wildcard with User-agent to include all search engines

How to Use Robots.txt to Allow or Disallow Everythin

  1. Robots.txt. Crawlers created using Scrapy 1.1+ already respect robots.txt by default. If your crawlers have been generated using a previous version of Scrapy, you can enable this feature by adding this in the project's settings.py: ROBOTSTXT_OBEY = True. ROBOTSTXT_OBEY = True. ROBOTSTXT_OBEY = True
  2. Robots.txt: The Tiny Website File That Can Make or Break Your SEO Introducing the Robots.txt File. Pretty much, a robots.txt file is what you see below—a small text file located at the root of your website: It states, on three lines: the User-agent you want to work with; a Disallow field to tell search engine bots and crawlers what not to craw
  3. User-Agent: * Allow: /dir/sample.html Disallow: /dir/ -- -- robots.txtファイルの記述の仕方について解説しました。robots.txtには今回のようにクロールの制限に関する記述だけでなくサイトマップの場所を記述することもできます
  4. MJ12bot adheres to the robots.txt standard. If you want the bot to prevent website from being crawled then add the following text to your robots.txt: User-agent: MJ12bot Disallow: / Please do not block our bot via IP in htaccess - we do not use any consecutive IP blocks as we are a community based distributed crawler
  5. In my blog's Google Webmaster Tools panel, I found the following code in my robots.txt of blocked URLs section. User-agent: Mediapartners-Google Disallow: /search Allow: / I know that Disallow will prevent Googlebot from indexing a webpage, but I don't understand the usage of Disallow: /search. What is the exact meaning of Disallow: /search

فایل Robots.txt چیست؟ راهنمای کامل نحوه ساخت فایل Robots.tx

  1. User-agent: * Disallow: / # Certain social media sites are whitelisted to allow crawlers to access page markup when links to /images are shared. User-agent: Twitterbot: Allow: /images: User-agent: facebookexternalhit: Allow: /image
  2. Ein Working Draft der IETF führt neben der Disallow Anweisung auch die Allow Anweisung ein:. User-agent: * Disallow: /temp/ Allow: /temp/daily.html Da die Allow Anweisung aber erst später als der eigentliche Standard eingeführt wurde, wird sie noch nicht von allen Robots unterstützt. Von daher sollte man sich nicht darauf verlassen und lieber nur Disallow benutzen
  3. c. Sitemap Mentioning the link to your sitemap within the robots file is an optional but a good practice to follow.. Robots txt is the first file that the search crawler looks for after landing on your website. The availability of the sitemap URL makes the crawler's job easy as it can use the sitemap to build an understanding of your website content
  4. Pages that you disallow in your robots.txt file won't be indexed, and spiders won't crawl them either. Robots.txt Format. The format for a robots.txt file is a special format but it's very simple. It consists of a User-agent: line and a Disallow: line. The User-agent: line refers to the robot

# 80legs User-agent: 008 Disallow: / # 80legs' new crawler User-agent: voltron Disallow: / User-Agent: bender Disallow: /my_shiny_metal_ass User-Agent: Gort Disallow. User-agent: * Disallow: /example-page/ This would tell Google to stop crawling this specific path. Variations of this URL like /example-page/path would also be blocked. Tip - The * rule applies to every bot unless there is a more specific set of rules. If you've added the Googlebot user agent your robots.txt will look like this: User-agent.

robots.txt 설정하기 - 네이버 서치어드바이

  1. # # robots.txt # # This file is to prevent the crawling and indexing of certain parts # of your site by web crawlers and spiders run by sites like Yahoo! # and Google. By telling these robots where not to go on your site, # you save bandwidth and server resources
  2. robots.txtを作成する場合には、書き方を間違えないよう、慎重に確認しましょう。 関連記事:SEOチェックリストのダウンロード; robots.txtの最適化によるSEO対策. robots.txtはクローラーの巡回を制御する方法の1つで、SEO対策の一環です
  3. User-Agent: * Disallow: Disallow: /assets/ Disallow: /assets/css Disallow: /assets/fonts Disallow: /assets/images Disallow: /assets/js Disallow: /privacy policy.txt.
  4. / Allow: /wp-ad
  5. Robots.txt is a simple text file that sites in the root directory of your site. It tells robots (such as search engine spiders) which pages to crawl on your site, which pages to ignore. While not essential, the Robots.txt file gives you a lot of control over how Google and other search engines see your site
  6. For example, the following robots.txt file will block Zoom from indexing any files in a folder named secret and any files named private.html. It will also force a delay of 5 seconds between requests to this start point. # this is a comment - my robots.txt file for www.mysite.com User-agent: ZoomSpider Disallow: /secret/ Disallow: private.htm

You think that putting the disallow rules into your robots.txt will stop your site showing up in the search engines. So you place the following into your robots.txt file to block web crawlers: User-agent: * Disallow: / And then you discover at a later stage your pages are somehow still showing up in Google or Bing. Not good, you were not ready with your new site design yet, and now it's. Dans le fichier robots.txt, vous identifierez donc chaque robot par son user-agent comme ceci : User-agent: Googlebot dans le cas du robot de Google. Chaque crawler doit également avoir un user agent. Dans les cas des crawlers « officiels », sous-entendu, ceux qui ne sont pas mal intentionnés, vous pouvez facilement les identifier

What is robots.txt? How a robots.txt file works Cloudflar

Esse é o esqueleto básico de um arquivo robots.txt. O asterisco depois de user-agent indica que o arquivo robots.txt se aplica a todo tipo de robô da internet que visita o site. A barra depois de Disallow informa ao robô para não visitar nenhuma das páginas do site User-agent: * Crawl-Delay: 20 Robots.TXT File Thread starter Nick 11; Start date Jun 30, 2020; Nick 11 Member. Joined Mar 29, 2020 Messages 8 Reaction score 2. Jun 30, 2020 #1 Hello User-agent: * Crawl-Delay: 20 Rankings have dropped, checked /robots.txt and the above is what I get, also a screenshot of Google Search Console attached as an. To stop SemrushBot from crawling your site, add the following rules to your robots.txt file: To block SemrushBot from crawling your site for a webgraph of links: User-agent: SemrushBot Disallow: / SemrushBot for Backlink Analytics also supports the following non-standard extensions to robots.txt: Crawl-delay directives

Permitir el acceso mediante el archivo robots.txt. Para permitir que Google acceda a su contenido, compruebe que el archivo robots.txt permite a los user-agents Googlebot, AdsBot-Google y Googlebot-Image rastrear el sitio. Puede hacerlo añadiendo las siguientes líneas al archivo robots.txt: User-agent: Googlebot. Disallow User-agent: * Disallow: / You can also prevent robots from crawling parts of your site while allowing them to crawl other sections. The following example would request search engines and robots not to crawl the cgi-bin folder, the tmp folder, and the junk folder, and everything in those folders on your website robots.txt 문서는 일반 사용자 분들이나 사이트를 제작한지 얼마 안되신 분들에게는 아마 생소한 문서 이실겁니다. 무엇을 하고 이게 왜 필요 한지에 대해서도 모르실것이구요. 구글이나 위키백과 같은 곳에서는 다음과 같이 정의 하고 있습니다

Правильная настройка robots

How to Edit a Robots

Overview of Google crawlers (user agents) Search Centra

  1. In your robots.txt file, you can choose to define individual sections based on user agent. For example, if you want to authorize only BingBot when others crawlers are disallowed, you can do this by including the following directives in your robots.txt file: User-Agent: * Disallow: / User-Agent: bingbot Allow:
  2. The User-agent: rule specifies which User-agent the rule applies to, and * is a wildcard matching any User-agent. Disallow: sets the files or folders that are not allowed to be crawled. Here are some of the most common uses of the robots.txt file
  3. 3. User-Agent. The User-Agent request header is a character string that lets servers and network peers identify the application, operating system, vendor, and/or version of the requesting user agent. Some websites block certain requests if they contain User-Agent that don't belong to a major browser
  4. PetalBot is an automatic program of the Petal search engine. The function of PetalBot is to access both PC and mobile websites and establish an index database which enables users to search the content of your site in Petal search engine. You can identify crawling from Petal by analyzing the User-agent field
  5. While some commenters pointed out a similar robots.txt in comments here, Gary Illyes from Google confirmed the use of this in robots.txt at stackoverflow. the simplest form of allow rule to allow crawling javascript and css resources: User-Agent: Googlebot Allow: .js Allow: .cs
  6. User-agents and robots.txt. By default, Wget strictly follows a website's robots.txt directives. In certain situations this will lead to Wget not grabbing anything at all, if for example the robots.txt doesn't allow Wget to access the site. To avoid this: first, you should try using the --user-agent option: wget -mbc --user-agent= http.
  7. Robots.txt Agents. Syntax: one or more user-agent strings, one per line This is a list of user agents to respect when checking robots.txt on a site. The robots.txt group with the User-agent string that is a case-insensitive substring of the earliest agent listed in Robots.txt Agents will be used; i.e. the Robots.txt Agents should be listed highest-priority first

A robots.txt file contains directives (instructions) about which user agents can or cannot crawl your website. A user agent is the specific web crawler that you are providing the directives to. The instructions in the robots.txt will include certain commands that will either allow or disallow access to certain pages and folders of your website. These directives can be specified for all search engines or for specific user agents identified by a user-agent HTTP header. Within the Add Disallow Rules dialog you can specify which search engine crawler the directive applies to by entering the crawler's user-agent into the Robot (User Agent) field A robots.txt file may specify a crawl delay directive for one or more user agents, which tells a bot how quickly it can request pages from a website. For example, a crawl delay of 10 specifies that a crawler should not request a new page more than every 10 seconds

Robots.txt : How to Create the Perfect File for SEO - SEOquak

The purpose of the robots.txt file is to tell the search bots which files should and which should not be indexed by them. Most often it is used to specify the files which should not be indexed by search engines. To allow search bots to crawl and index the entire content of your website, add the following lines in your robots.txt file:. User-agent: Robots.txt Generator. Search Engines are using robots (or so called User-Agents) to crawl your pages. The robots.txt. file is a text file that defines which parts of a domain can be crawled by a robot.. In addition, the robots.txt file can include a link to the XML-sitemap There are different types of robots.txt files, so let's look at a few different examples of what they look like. Let's say the search engine finds this example robots.txt file: This is the basic skeleton of a robots.txt file. The asterisk after user-agent means that the robots.txt file applies to all web robots that visit the site User-agent: * Disallow: /wp-admin/ Disallow: /wp-includes/ This is an example of a very basic robots.txt file. To put it in human terms, the part right after User-agent: declares which bots the rules below apply to

The ROBOTS.TXT is a file that is typically found at the document root of the website. You can edit the robots.txt file using your favorite text editor. In this article, we explain the ROBOTS.TXT file and how to find and edit it. The following is the common example of a ROBOTS.TXT file: User-agent: * Disallow: If the robots.txt file does not contain any directives that disallow a user-agent's activity (or if the site doesn't have a robots.txt file), it will proceed to crawl other information on the site. Why do you need Robots.Txt? As of now, we know that Robots.Txt file directs the Crawler and Search Engine Bot about the Web Page indexation 什么是robots.txtrobots.txt是网站管理者写给爬虫的一封信,里面描述了网站管理者不希望爬虫做的事,比如: 不要访问某个文件、文件夹禁止某些爬虫的访问限制爬虫访问网站的频率一个自觉且善意的爬虫,应该在抓 User-agent: UbiCrawler Disallow: / User-agent: DOC Disallow: / User-agent: Zao Disallow: / # Some bots are known to be trouble, particularly those designed to copy # entire sites. Please obey robots.txt

Grundlagen/Robots.txt - SELFHTML-Wik

User-agent: SemrushBot Crawl-delay: 60 Block SEMrush' backlink audit tool, but allow other tools And say you only want to block their backlink audit tool, but allow their other tools to access the site you can put this in your robots.txt The User-Agent directive refers to the specific web spider/robot/crawler. For example the User-Agent: Googlebot refers to the spider from Google while User-Agent: bingbot refers to crawler from Microsoft/Yahoo!.User-Agent: * in the example above applies to all web spiders/robots/crawlers as quoted below: User-agent: * The Disallow directive specifies which resources are prohibited by. Directives: [path] (Rules for the robot(s) specified by the User-agent) The file itself should be plain text encoded in UTF-8. Setting User-agent: Setting User-agent: is trivial, but somewhat important to get right! As everything in a robots.txt file is operated on a text matching basis, you need to be very specific when declaring a user agent

Robots.txt and SEO: Everything You Need to Kno

NPM version Actions Build Status AppVeyor build status Reliability Rating Coverage FOSSA Status gatsby-plugin-robots-txt Create for your New Webinar Headless Shopify From first commit to first sale, Gatsby and Shopify break down the journey - Register No User-agent: * Disallow: /data/ Disallow: /scripts/ You can even disallow all robots from accessing anywhere on your site with this robots.txt. User-agent: * Disallow: / The 'User-agent' command can be used to restrict the commands to a specific web robots. In my examples I'm using a '*' to apply the commands to all robots Yandex robots correctly process robots.txt, if: The file size doesn't exceed 500 KB. It is a TXT file named robots, robots.txt. The file is located in the root directory of the site. The file is available for robots: the server that hosts the site responds with an HTTP code with the status 200 OK. Check the server respons User-agent. They are Web Robots (also known as Web Wanderers, Crawlers, or Spiders), are programs that traverse the Web automatically. Search engines such as Google use them to index the web content, spammers use them to scan for email addresses, and they have many other uses

How to Set Up Robots

The basic format for a robots.txt file looks like this: User-agent: [user-agent name] Disallow: [URL string not to be crawled] User-agent: [user-agent name] Allow: [URL string to be crawled] Sitemap: [URL of your XML Sitemap] You can have multiple lines of instructions to allow or disallow specific URLs and add multiple sitemaps.. If you find this in the robots.txt file of a website you're trying to crawl, you're in luck. This means all pages on the site are crawlable by bots. 2. Block All Access. User-agent: * Disallow: / You should steer clear from a site with this in its robots.txt. It states that no part of the site should be visited by using an automated crawler. For those sites, you want to use directives in the Robots.txt file to define the paths that the search engine can crawl. You set the following directive for the default user-agent of the crawler: User-Agent: Mozilla/4.0 (compatible; MSIE 4.01; Windows NT; MS Search 6.0 Robot) In this scenario, the SharePoint Server crawler doesn't apply the. The robots.txt file can simply be created using a text editor. Every file consists of two blocks. First, one specifies the user agent to which the instruction should apply, then follows a Disallow command after which the URLs to be excluded from the crawling are listed. The user should always check the correctness of the robots.txt file.


The following are some common uses of robots.txt files. To allow all bots to access the whole site (the default robots.txt) the following is used: User-agent:* Disallow: To block the entire server from the bots, this robots.txt is used: User-agent:* Disallow: /. To allow a single robot and disallow other robots And this is where a robots.txt file comes into play. This file can help control the crawl traffic and ensure that it doesn't overwhelm your server. Web crawlers identify themselves to a web server by using the User-Agent request header in an HTTP request, and each crawler has their own unique identifier. Most of the time you will need to. Robots.txt syntax. User-Agent: the robot to which the following rules will be applied (for example, Googlebot). The user-agent string is a parameter which web browsers use as their name. But it contains not only the browser's name but also the version of the operating system and other parameters User-agent: googlebot Disallow: /a . Robots.txt Allow. The robots.txt allow rule explicitly gives permission for certain URLs to be crawled. While this is the default for all URLs, this rule can be used to overwrite a disallow rule