tests: fixed ci.

Author: zhuizhuhaomeng

.travis.yml

@@ -52,6 +52,7 @@ before_install:
   - echo "deb http://openresty.org/package/ubuntu $(lsb_release -sc) main" | sudo tee /etc/apt/sources.list.d/openresty.list
   - sudo apt-get update
   - sudo DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends openresty-pcre2 openresty-openssl3 openresty-pcre2-dev openresty-openssl3-dev
+  - echo "127.0.0.1 localhost" | sudo tee -a /etc/hosts
 
 install:
   - if [ -n "$PCRE2_VER" ] && [ ! -f download-cache/pcre2-$PCRE2_VER.tar.gz ]; then wget -P download-cache https://github.com/PCRE2Project/pcre2/releases/download/pcre2-${PCRE2_VER}/pcre2-${PCRE2_VER}.tar.gz; fi