cURL send file: cURL file upload tutorial

Teach you how to use cURL to transfer files with a proxy.

Web developers should have encountered this situation - when uploading files with cURL is always restricted by the target site. This is where we need to bring out our savior!proxy IPI'm not sure if you're going to be able to do that. Today, we take our own product ipipgo as a chestnut, teach everyone how to protect the real IP during file transfer.

Why do you need a proxy to transfer files?

Let's take a real scenario: Zhang San wants to transfer a super-large video file to the customer's system, but the transfer was interrupted three times. There are two benefits of using a proxy IP at this time:

1. Avoid single IP speed limit
2. break through the server's concurrent connection limit
3. Hide the identity of the real server (this is especially suitable for those who do data collection)

ipipgo's Dynamic Residential Proxy has a wonderful feature: it automatically switches IP every time you upload, which is a perfect solution to the problem of large file transfers being pinched. We have tested, with their agent to transfer 10GB file success rate can be 98%.

Minimalist cURL file upload command

Let's look at the basic operation first, and then later on how to add agents:

curl -F "file=@/path/to/yourfile.zip" http://目标网址/upload

This -F parameter is the switch for file uploading, note that the @ symbol cannot be missing! Many newbies fall for this symbol.

The right way to open a proxy IP

Here's the kicker, how do you sling ipipgo's proxy in? Look at this template:

curl -x http://用户名:密码@proxy IP:port -F "file=@local file path" Destination URL

To give a real-life example:

curl -x http://ipipgo_user:abc123@45.76.189.12:8080 -F "file=@/users/桌面/报价单.pdf" https://客户系统.com/upload

Watch out for potholes:

Trifecta of combat techniques

Tip one:Remember to add a timeout setting for large file transfers

curl -x http://ipipgo代理信息 --max-time 3600 -F "file=@large file" Destination address

Tip two:Batch upload with IP rotation

for file in .log; do
  curl -x http://随机获取ipipgo代理 -F "file=@$file" target address
done

Tip Three:Turn on detailed mode first when debugging

curl -v -x proxy address ...

Frequently asked questions on demining

Q: What can I do if the agent can't connect?
A: First check the three elements: IP, port, authentication information is consistent with the ipipgo background display. If it doesn't work yet, their customer service response is quite fast and they can change the new IP within 5 minutes.

Q: What should I do if I get disconnected in the middle of a file transfer?
A: ipipgo's recommendedLong-lasting static proxiesIf you are using a dynamic IP, remember to add the disconnect script. If you use a dynamic IP, remember to add an intermittent transfer script.

Q: Why is the upload speed slower?
A: The load of the current proxy node may be high. In ipipgo console there is a "speed test" function, change a node with low latency.

Say something from the heart.

After using seven or eight proxy services, I finally chose ipipgo mainly because of theirBank-level IP pool managementThis is especially important when doing automated upload scripts. Especially when doing automated upload scripts, their API can get proxies in milliseconds, which is too important for scenarios that require high-frequency IP changes. Recently discovered that they have another cold feature - theDesignated City NodeThe site has some geo-restricted sites that work very well with this trick.

Lastly, I would like to remind newbies: use the pay-per-volume package during the testing phase, and then buy a monthly subscription when it runs smoothly. In case of technical problems, directly find their technical guy video remote, much faster than reading documents.