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HTTP Protocol Interview Questions & Answers - Learning Mode

HTTP Protocol Interview Questions & Answers - Learning Mode

The Hypertext Transfer Protocol (HTTP) is an application protocol for distributed, collaborative, hypermedia information systems. HTTP is the foundation of data communication for the World Wide Web. Hypertext is structured text that uses logical links (hyperlinks) between nodes containing text. HTTP is the underlying protocol used by the World Wide Web. HTTP defines how messages are formatted and transmitted, and what actions Web servers and browsers should take in response to various commands.

Try HTTP Protocol Interview Questions & Answers - Exam Mode

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HTTP Protocol Interview Questions & Answers - Learning Mode
Try HTTP Protocol Interview Questions & Answers - Exam Mode
Question: What is the minimum and maximum size of an IP datagram header?

Answer: The minimum size of an IP datagram header is 20 bytes. The maximum IP datagram header size is 60 bytes. Source:
Question: Explain Secure HTTP?

Answer: There are currently two methods of establishing a secure HTTP connection: the https URI scheme and the HTTP 1.1 Upgrade header, introduced by RFC 2817. Browser support for the Upgrade header is, however, nearly non-existent, so HTTPS is still the dominant method of establishing a secure HTTP connection. Secure HTTP is notated by the prefix https:// instead of http:// on web URIs. Source:
Question: What is the meaning of 400 Bad Request HTTP response codes?

Answer: The request was malformed. This happens especially with POST and PUT requests, when the data does not pass validation, or is in the wrong format. Source:
Question: What is HTTP (HyperText Transfer Protocol)?

Answer: HTTP is the protocol of the Web, by which Servers and Clients (typically
browsers) communicate. An HTTP transaction comprises a Request sent by
the Client to the Server, and a Response returned from the Server to the Client.
Every HTTP request and response includes a message header, describing the message. These are processed by the HTTPD, and may often be
mostly ignored by CGI applications (but see below).A message body may also be included:
1) A HEAD or GET request sends on Source:
Question: What do you mean by IP is an unreliable protocol?

Answer: IP is a unreliable protocol because it does not guarantee the delivery of a datagram to its destination. The reliability must be provided by the upper layer protocols like TCP. IP does not support flow control, retransmission, acknowledgement and error recovery.
Question: What is Idempotent methods and web applications in case of HTTP Protocol?

Answer: Methods PUT and DELETE are defined to be idempotent, meaning that multiple identical requests should have the same effect as a single request. Methods GET, HEAD, OPTIONS and TRACE, being prescribed as safe, should also be idempotent, as HTTP is a stateless protocol. Source:
Question: What is the mean of GET?

Answer: GET is the simplest type of HTTP request method; the one that browsers use each time you click a link or type a URL into the address bar. It instructs the server to transmit the data identified by the URL to the client. Data should never be modified on the server side as a result of a GET request. In this sense, a GET request is read-only, but of course, once the client receives the data, it is free to do any operation with it on its own side - for instance, format it for display. Source:
Question: What is the meaning of 500 Internal Server Error HTTP response codes?

Answer: When all else fails; generally, a 500 response is used when processing fails due to unanticipated circumstances on the server side, which causes the server to error out. Source:
Question: For what purposes POST is used?

Answer: POST is used when the processing you wish to happen on the server should be repeated, if the POST request is repeated (that is, they are not idempotent; more on that below). In addition, POST requests should cause processing of the request body as a subordinate of the URL you are posting to. Source:
Question: What is the meaning of HTTP Verbs?

Answer: HTTP Verbs tell the server what to do with the data identified by the URL.
HTTP Verbs tell the server what to do with the data identified by the URL. The request can optionally contain additional information in its body, which might be required to perform the operation - for instance, data you want to store with the resource. You can supply this data in cURL with the -d option. Source:
Question: What is https Uniform Resource Identifier (URI) Scheme?

Answer: https is a Uniform Resource Identifier (URI) Scheme that is, aside from the scheme token, syntactically identical to the http scheme used for normal HTTP connections, but which signals the browser to use an added encryption layer of SSL/TLS to protect the traffic. SSL is especially suited for HTTP since it can provide some protection even if only one side of the communication is authenticated. This is the case with HTTP transactions over the Internet, where typically only the server is authentic Source:
Question: What HTTP response headers do?

Answer: Unless you are using NPH, the HTTPD will insert necessary response headers on your behalf, always provided it is configured to do so.
However, it is conventional for servers to insert the Content-Type header based on a page's filename, and CGI scripts cannot rely on this. Hence the usual advice is to print an explicit Content-Type header.
At least one of "Content-Type", "Status" and "Location" is almost always required. Source:
Question: What is the meaning of PUT Request in case of HTTP Protocol?

Answer: A PUT Request is used when you wish to create or update the resource identified by the URL. For example,
1 PUT /clients/robin
might create a client, called Robin on the server. You will notice that REST is completely backend agnostic; there is nothing in the request that informs the server how the data should be created - just that it should. This allows you to easily swap the backend technology if the need should arise. PUT requests contain the data to use in updating or creating the reso Source:
Question: To which OSI layer does IP belong?

Answer: IP belongs to the Network Layer (layer 3) in the OSI model.

internet protocol is working in network layer of osi model in congection with tcp tx layer protocol. Source:
Question: What do you mean by IP is a best-effort protocol?

Answer: IP is a best-effort protocol, because it will make every effort to always transmit a datagram and also datagrams will not be just discarded. However, the delivery of the datagram to the destination is not guaranteed. Source:
Question: Explain about Persistent Connections in HTTP?

Answer: In HTTP/0.9 and 1.0, the connection is closed after a single request/response pair. In HTTP/1.1 a keep-alive-mechanism was introduced, where a connection could be reused for more than one request. Source:
Question: What are response codes in HTTP?

Answer: HTTP response codes standardize a way of informing the client about the result of its request.
You might have noticed that the example application uses the PHP header(), passing some strange looking strings as arguments. The header() function prints the HTTP headers and ensures that they are formatted appropriately. Headers should be the first thing on the response, so you shouldn't output anything else before you are done with the headers. Sometimes, your HTTP server may be configured to Source:
Question: From what HTTP messages are made?

Answer: HTTP messages are made of a header and a body. The body can often remain empty; it contains data that you want to transmit over the network, in order to use it according to the instructions in the header. The header contains metadata, such as encoding information; but, in the case of a request, it also contains the important HTTP methods. In the REST style, you will find that header data is often more significant than the body Source:
Question: Described the most important HTTP Verbs?

Answer: There are far more HTTP Verbs available. The most important ones for building Restful API are GET, POST, PUT and DELETE. Other methods are available, such as HEAD and OPTIONS, but they are more rare (if you want to know about all other HTTP methods, the official source is IETF). Source:
Question: Describe the different roles of HTTP?

Answer: In HTTP, there are two different roles: Server and Client. In general, the client always initiates the conversation; the server replies. HTTP is text based; that is, messages are essentially bits of text, although the message body can also contain other media. Text usage makes it easy to monitor an HTTP exchange. Source:

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