You know these, you have seen URLs like or a million times. The Uniform Resource Locator format is how you specify the address of a particular resource on the Internet. You need to redirect it somewhere to avoid that, most often that is done with -o or -O. It will prepend the transfer and connection identifier to each trace output line: curl -trace-ascii d.txt -trace-ids īy default curl sends the response to stdout. When response headers are received (and logged) you need to know which transfer these are for. When doing parallel transfers, it is relevant to see which transfer is doing what. It will prepend the time to each trace output line: curl -trace-ascii d.txt -trace-time For those, and other similar situations, the -trace-time option is what you need. Many times you may wonder what exactly is taking all the time, or you just want to know the amount of milliseconds between two points in a transfer. Use it like this: curl -trace-ascii debugdump.txt Then -trace and -trace-ascii offer even more details as they show everything curl sends and receives. verbose is the single most useful option when it comes to debug or even understand the curlserver interaction. Using curl's option -verbose ( -v as a short option) will display what kind of commands curl sends to the server, as well as a few other informational texts. The "body" part is the plain data you requested, like the actual HTML or the image etc. The HTTP server responds with a status line (indicating if things went well), response headers and most often also a response body. The request contains a method (like GET, POST, HEAD etc), a number of request headers and sometimes a request body. HTTP is plain ASCII text lines being sent by the client to a server to request a particular action, and then the server replies a few text lines before the actual requested content is sent to the client. The protocol also allows information to get sent to the server from the client using a few different methods, as will be shown here. It is a simple protocol that is built upon TCP/IP. HTTP is the protocol used to fetch data from web servers. You probably need to glue everything together using some kind of script language or repeated manual invokes. It makes the requests, it gets the data, it sends data and it retrieves the information. This documents assumes that you know how to invoke curl -help or curl -manual to get basic information about it.Ĭurl is not written to do everything for you. To be able to automatically extract information from the web, to fake users, to post or upload data to web servers are all important tasks today.Ĭurl is a command line tool for doing all sorts of URL manipulations and transfers, but this particular document will focus on how to use it when doing HTTP requests for fun and profit. The increasing amount of applications moving to the web has made "HTTP Scripting" more frequently requested and wanted. This document assumes that you are familiar with HTML and general networking. Tutorial The Art Of Scripting HTTP Requests Using Curl Background
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