composer 报 Failed to decode resp

造成这个问题的原因有好多，可以依次试试下列方法

方法一

从上往下依次执行

composer clear-cache
composer diagnose
composer self-update

方法二

修改 php.ini 文件（./etc/php.ini）

; Transparent output compression using the zlib library
; Valid values for this option are 'off', 'on', or a specific buffer size
; to be used for compression (default is 4KB)
; Note: Resulting chunk size may vary due to nature of compression. PHP
;   outputs chunks that are few hundreds bytes each as a result of
;   compression. If you prefer a larger chunk size for better
;   performance, enable output_buffering in addition.
; Note: You need to use zlib.output_handler instead of the standard
;   output_handler, or otherwise the output will be corrupted.
; http://php.net/zlib.output-compression
zlib.output_compression = On

; http://php.net/zlib.output-compression-level
zlib.output_compression_level = 5

方法三

关闭 IPV6