HTTP headers lookup

HTTP headers are a collection of information sent with every request and response in a web browser. This information includes the URL, the requested file, the client's IP address, and other important data. 

Knowing what this information means to troubleshoot problems or learn more about how a website works can be helpful. Header information is pretty easy to read and understand, but it can be a bit overwhelming initially,

What are the HTTP headers?

HTTP Headers are used to control the way a web browser communicates with a website. Knowing how they work is essential because they can reveal information about your connection, including your IP address and browser type. 

HTTP Headers lookup

HTTP headers are used to provide information about a request and response. This can include the user agent, the requested page, the requested resource, the response status code, and more.

List of Common HTTP Headers

  • Accept: Indicates the types of content the client can understand.

  • Accept-Charset: Indicates the character encodings that the client can understand.
  • Accept-Encoding: Indicates the types of content encoding the client can understand.
  • Accept-Language: Indicates the natural language that the client prefers.
  • Authorization: Provides authentication information for the client to access the requested resource.
  • Cache-Control: Indicates the caching policies for the requested resource.
  • Connection: Indicates the type of connection that the client prefers.
  • Cookie: Contains a string of key-value pairs that provide information about the client's session.
  • Host: Indicates the server's hostname that the client is trying to connect to.
  • If-Modified-Since: Requests that the resource is returned only if it has been modified since the specified date.
  • User-Agent: Identifies the client software and version and possibly information about the client's operating system, device, or application.
  • Content-Type: Indicates the media type of the resource being sent or requested.
  • Content-Length: Indicates the size of the body of the request or response.
  • ETag: Provides a unique identifier for the version of the resource being returned.
  • Location: Indicates the URL to redirect a page to.

HTTP headers lookup and SEO

1. What are lookup http headers?

  • 1.Http headers provide information about the request and response.
  • 2.Http headers can be used for debugging purposes.
  • 3.Http headers can be used to track the progression of a request.
  • 4.Http headers can be used to customize the user experience.
  • 5. There are several different http header types.

What are the HTTP headers for?

1. Accept: Specifies the MIME types supported by the client.

2. Accept-Charset: Specifies character sets and encodings accepted for a response.

3. Accept-Encoding: Specifies compression schemes and coding levels used in the request message body.

4. Accept-Language: Specifies the preferred languages for a response.

5. Accept-Ranges: Specifies the acceptable range of time values for a response. 6. Accept-Type: Specifies the type of resource requested by a client and how it is processed. 7. Age: Specifies the time to live for a response.

8. Cookie: Specifies information passed with each request to a server.

9. Content-Encoding: Specifies the compression scheme and coding level used in the message body of a request.

10. Content-Length: Specifies the length of a message.

11. Content-Type: Specifies the format in which data is encoded for transmission, typically as a MIME type or text/plain.

12. Cookie: Specifies information passed with each request to a server. 13. ETag: Specifies the current value of a resource's state, for example, the last-modified time for a file.

14. Expires: Specifies the time at which a response expires. 15. If-Match: Specifies that the request is only valid if the specified value matches the current state of a resource.

16. If-Modified-Since: Specifies that the request is only valid if the specified value is newer than the current state of a resource.

17. If-None-Match: Specifies that the request is only valid if the specified value does not match the current state of a resource.

Which header is used by search engines to index your websites?

  • Last-Modified 
  • Expires 
  • Cache-Control 
  • ETag 

If-Modified-Since f. HTTP/1.1 g. WWW-Authenticate h. Vary:* i. User-Agent 

What response should you use when getting a list of files in the directory? 

a. 304 

b. 400 

c. 403 

d. 500 

e. 503 

f. 200 

g. 301 

h. 404 

i. 500 5

What HTTP status codes are there?

HTTP status codes are three-digit numbers that indicate the status of a response to an HTTP request. Here is a list of some common HTTP status codes:

1xx (Informational):

  • 100 Continue
  • 101 Switching Protocols

2xx (Successful):

  • 200 OK
  • 201 Created
  • 202 Accepted
  • 203 Non-Authoritative Information
  • 204 No Content
  • 205 Reset Content
  • 206 Partial Content

3xx (Redirection):

  • 300 Multiple Choices
  • 301 Moved Permanently
  • 302 Found
  • 303 See Other
  • 304 Not Modified
  • 305 Use Proxy
  • 307 Temporary Redirect

4xx (Client Error):

  • 400 Bad Request
  • 401 Unauthorized
  • 402 Payment Required
  • 403 Forbidden
  • 404 Not Found
  • 405 Method Not Allowed
  • 406 Not Acceptable
  • 407 Proxy Authentication Required
  • 408 Request Timeout
  • 409 Conflict
  • 410 Gone
  • 411 Length Required
  • 412 Precondition Failed
  • 413 Request Entity Too Large
  • 414 Request-URI Too Long
  • 415 Unsupported Media Type
  • 416 Requested Range Not Satisfiable
  • 417 Expectation Failed

5xx (Server Error):

  • 500 Internal Server Error
  • 501 Not Implemented
  • 502 Bad Gateway
  • 503 Service Unavailable
  • 504 Gateway Timeout
  • 505 HTTP Version Not Supported

How to lookup http headers using the command line?

The following command can be used to see the http headers from a specific server. Check out the output of this command: $ curl -I -n HTTP/1. 1 200 OK Date: Mon, 29 Oct 2008 18:56:32 GMT Server: Apache/2.0.40 (Unix) mod_ssl/2.0.40 OpenSSL/1.0.0e-fips mod_bwlimited/1.

How to lookup http headers using a web browser?

Use a web browser to see the headers of the requested page. If using Firefox, go to the "Tools" menu and select "View Page Source." In Chrome, press Ctrl + U, select "View Page Source." The following is an example of the headers shown in Firefox: 1.

What are the benefits of using lookup http headers?

You can use the header information to identify whether the response is a valid one or not. If you use a web browser, you can use the header information to see if the server sends an https or http response. You can also check if the server returns a valid date or time.

How do I check HTTP headers?

There are several ways to check the HTTP headers of a website or web page. One way is to use a browser developers tool, such as the "Network" tab in Chrome's DevTools or the "Web Console" in Firefox's Developer Tools. 

Another way is to use a command-line tool like cURL or a website like

What are the 4 types of HTTP headers?

HTTP headers can be classified into four main categories:

  • Request headers provide information about the request and the client requesting the resource.
  • Response headers provide information about the response and the server responding to the request.
  • Entity headers give information on the body of the request or response.
  • General headers, provide information that applies to both requests and responses.

Are headers visible in HTTP?

  • Yes, headers are a visible part of an HTTP request or response and can be viewed using developer tools in a web browser or a tool like cURL.

What are the headers in HTTP?

HTTP headers are a collection of key-value pairs that provide additional information about the request or response, such as the content type, encoding, and caching policies. 

Some common headers include "Accept," "Content-Type," "Authorization," "User-Agent," "Cache-Control," "Connection," and "Cookie."

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