Hi i found this problem when i use HttpParams.append

[luocongqiu]

🐞 bug report

Affected Package

Unfortunately, I cannot tell precisely, which package of @angular is causing the behavior.

Is this a regression?

the previous version also had the same problem

Description

        let params = new HttpParams();
        params = params.append('status', '1');
        params = params.append('status', '2');
        console.info(params.get('status'));
        params = params.set('name', 'test');
        params = params.append('status', '3');
        console.info(params.toString());

log

1
status=1&status=2&status=1&status=2&status=3&name=test

status=1&status=2 will repeat

🔬 Minimal Reproduction

🔥 Exception or Error

See Description

🌍 Your Environment

Angular Version:

     "@angular/common": "~7.2.0",
    "@angular/compiler": "~7.2.0",
    "@angular/core": "~7.2.0",
    "@angular/forms": "~7.2.0",
    "@angular/platform-browser": "~7.2.0",
    "@angular/platform-browser-dynamic": "~7.2.0",
    "@angular/router": "~7.2.0",

Anything else relevant?
no

[trotyl]

Duplicate of #20430

[AndrewKushnir]

Hi @luocongqiu, I'm closing this ticket as a duplicate of #20430 (thanks @trotyl for the link). Please refer to issue #20430 for additional information and updates. Thank you.

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