Reasons and Solutions for Paypal Payment Jump Failure

I encountered a 502 bad gateway error when jumping to the paypal payment page. The jump URL is
https://www.paypal.com/cgi-bin/webscr?locale.x=zh_HK and

changed to a paypal button id You can, or just fill in a non-existing buttion id, that's fine. So the initial suspicion is the problem of the paypal button. Log in to paypal.com and go to View Tools->All tools->Paypal buttons
, select the button in question, create simile button, create a same button, and delete the options under the drop menu. Then add an item first, enter the content and price (the content in Chinese). Get the form code, run it in html, you can jump. Then increase it one by one. When the sixth item is added, a 502 error occurs. It

is sixth item. Is there any special character in the sixth item? Not found.

Then change the content of all dropmenu into English and increase to 8 items. No problem.

Is it not good for Chinese support? If it is not good, it is no problem to increase it to 5 items. So is the length limited?

Then organize the content of each item, and reduce the content on the premise of maintaining the meaning. Filled in 8 items of content and price

Regenerate html, you can jump successfully.

Therefore, the problem is that paypal has a limit on the length of the drop menu, but there is no prompt. More importantly, there was no problem before, but now I suddenly find this problem, and I don't know when this problem occurred. Paypal is really bad.

Find the official description of paypal:

Using Options Fields on Your Website


Option fields let your customers specify options (such as size or colour) for the items they purchase. Each item may have up to two options, and option fields are compatible with Buy Now Buttons, PayPal Shopping Cart, and Subscriptions and Recurring Payments buttons.

The requirements for your options fields are:
Each option name is limited to 30 characters
Your drop-down menu choices should not exceed 10 menu items of 30 characters each (if you are using the Button Factory to generate your HTML code. If you are editing the code by hand, you may add additional menu choices)
Option fields cannot be used for options that will alter the item's price
You will need to be comfortable editing HTML code to perform some of the tasks outlined in this article.

https://www.paypal.com/uk/cgi-bin/webscr?cmd=p/xcl/rec/options-help-outside