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SMTP:

SMTP stands for Simple Mail Transfer Protocol.

• This protocol is designed to exchange the file (called e-mails) between two mail servers.

• The sending server pushes the mails to the receiving server. So, it is a push protocol.

• SMTP message body should be in a 7-bit ASCII (American Standard Code for Information Interchange) format.

Format of the SMTP Message format:

S: 220 samplewebsite.edu

C: Hello Amelia

S: 250 Amelia please to meet you

C: Mail From

S: 250 amelia@mail.co....sender ok

C: RCPT To: < samplewebsite.edu >

S: 250 amelia@mail.co....Recipient ok

C: DATA

S: 354 Enter mal, end with “.” On a line by itself

C:XXXXX XXXX

C:XXXX XXXX

S: 250 Message accepted for delivery

C: QUIT

S: 221 samplewebsite.edu closing connection

The end of the message body is indicated by a period (‘.’). The line in the message body containing period at end indicates the message body.

Therefore, SMTP uses period (‘.’) to mark the end of the message body.

HTTP:

HTTP stands for Hypertext Transfer Protocol.

• It is designed to exchange the files (called objects) between client and server.

• The client requests the server for the required files. So, it is a pull protocol.

• For data transfer, there is no restriction on the format of the message body.

• There is no specific mark for the end of the message body in the HTTP protocol.

• Message body indicates the request or response of a message.

• It uses a field called “Content-Length header field” to indicate the length of the message body.

• Content header length indicates the length of the message and it represents a decimal value.

Content-Length: 1234 Content length refers the length of the message body.

Therefore, HTTP uses the “Content-Length header field” to indicate the length of the message body.

Comparison of end marks in HTTP and SMTP:

To mark the end of message body SMTP uses period, whereas HTTP doesn’t have such special marks. It uses “Content-Length header field” for message body length.

There is no specific format for message body in HTTP; it is not possible to use a specific mark like period which is used by SMTP.

Therefore, HTTP and SMTP do not use the same methods to indicate the end of the message body.


Please leave a comment below if you found this answer helpful. Happy learning!

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